Physics

How to calculate wavelength at half the velocity?

How to calculate wavelength at half the velocity?

Not sure about this which is why I am asking:

Qn: calculate the wavelength of an electron moving at half the velocity of light in a vacuum.

 Do just divide 3.0*10^8 as that is the speed of light in a vacuum?

smmrwds   167   1 Reply

rja5200

What is the frequency of light having a wavelength of 479 nm?

What is the frequency of light having a wavelength of 479 nm?

What is the wavelength (in nanometers) of radiation having a frequency of 2.93x10^9 Hz?

rj957   394   1 Reply

JulianDavis

How to you measure the wavelength of flames with a ruler?

How to you measure the wavelength of flames with a ruler?

I need to know how to measure the wavelength of a line of flames (from a ruben's tube).  I'm wondering if you can do it like measuring light (please explain that if it is).  And how do you do it with a ruler?

Thanks!

smokeyd   244   1 Reply

smokeyjou

what is a recent application of optics?

what is a recent application of optics?

I have to write a research paper on a recent application of optics, this paper is for a physics class. I did some research but only found old applications, for example, cameras, telescopes, etc. These are old applications, I need something more recen

smokeyd   240   1 Reply

nutcake852

Where can i take the Fiber Optics liscening exam without taking the course?

Where can i take the Fiber Optics liscening exam without taking the course?

i have a lot of knowledge in Fiber Optics but where can i take the fiber
optics exam to get certified. I live in new york city by the way.. I dont need to take any course i just need to take the test..........
HELP me out please thanks

NutritionMajor   365   1 Reply

Juliac009

All night sights are made with fibre optics?

All night sights are made with fibre optics?

Is it all of the night sights of guns (handguns normally) made of fibre optics? Or fibre optics are just for some modern types?

nusrse2014   279   1 Reply

firebird39

What is the study of Optics about?

What is the study of Optics about?

I am about to go to college in a few months and one of the majors i got interested in is called Optics?

what do they study, is it all about making Eye glasses and choosing contact lenses ? and light reflection and about physical theory's, Does it in

smokeypal23   262   2 Replies

JuliaH

Why can't you use fiber optics to make a cloaking device?

Why can't you use fiber optics to make a cloaking device?

Would you not be able to group a bunch of optics and arc them around an object to make it 'invisible'?
I'm sensing that this doesn't work since such a device doesn't exist but I don't understand why it shouldn't work.

smnam   399   3 Replies

smokeyd

What problem does adaptive optics correct?

What problem does adaptive optics correct?

What problem does adaptive optics correct?

What problem does adaptive optics correct?
 1.the opacity of the earth's atmosphere to some wavelengths of light
2.the light pollution of urban areas
 3.The absorption of ultraviolet by the ozone layer
 4.

nusrse2014   2335   1 Reply

NutritionMajor

How do we know that the universe is currently expanding, who proved it and how?

How do we know that the universe is currently expanding, who proved it and how?

Also, is the term used to describe the idea that the universe is expanding, inflation?
How was it proven that the universe is expanding and who proved it?
What are the consequences of the universe expanding?
How does that affect the universe and all

rizzlepuff8   583   2 Replies

smokebomb13

Interaction of interplanetary dust and sun's gravitational field

Interaction of interplanetary dust and sun's gravitational field

A particle of interplanetary dust is close to the Sun and interacts with the Sun's gravitational field as well as with the light emitted by the Sun. If it only interacts appreciably with the Sun, can it be pushed away from the Sun instead of bei

Saoris   1038   3 Replies

MedicLife

A particle of interplanetary dust is close to the Sun and interacts with the Sun

A particle of interplanetary dust is close to the Sun and interacts with the Sun

A particle of interplanetary dust is close to the Sun and interacts with the Sun's gravitational field as well as with the light emitted by the Sun. If it only interacts appreciably with the Sun, can it be pushed away from the Sun instead of bei

1vetboy   1567   1 Reply

bio_man

Monatomic Ideal Gas

Monatomic Ideal Gas

I need help with these questions..I am not sure if I am on the right path but please any insight will be appreciated...

1) 2.50 moles of a monatomic ideal gas expand adiabatically from an initial temperature of 300K and an initial volume o

kpere044   1557   1 Reply

Alexx

Why change of magnetic flux through a coil induces current in it?

Why change of magnetic flux through a coil induces current in it?

Please explain thoroughly, what kind of force act on the charges inside the coil due to which they start to flow when the magnetic flux through it is changed(suppose the magnetic field is to be produced by a permanent magnet). Also, why a constant ma

SmokeyV4L   1037   1 Reply

juliejjay

How does the flux of light from an isotropic source depend on the distance r from the source?

How does the flux of light from an isotropic source depend on the distance r from the source?

How does the flux of light from an isotropic source depend on the distance r from the source?

datheman   953   1 Reply

smokeypal23

How does flux densities differ between different absolute magnitudes of stars?

How does flux densities differ between different absolute magnitudes of stars?

a) By what factor does the flux density differ between a V=2.5 and V=5 star?
b) By what factor does the flux density differ between a V=12.5 star and a V=15 star?

smotwan   407   1 Reply

datheman

What is the electric flux through the surface?

What is the electric flux through the surface?

A plane rectangular surface 0.100 m on an edge is placed in a region of uniform electric field of magnitude 24.6 N/C.  The normal to the surface makes an angle of 330 with the direction of the electric field.  What is the electric flux through the su

firebucks74   451   2 Replies

fireflower

What is the change in the magnetic flux through the coil due to this rotation?

What is the change in the magnetic flux through the coil due to this rotation?

A flat, rectangular coil consisting of 60 turns measures 22.0 cm by 32.0cm . It is in a uniform, 1.30-T, magnetic field, with the plane of the coil parallel to the field. In 0.210s  , it is rotated so that the plane of the coil is perpendicular to th

fireflower   552   1 Reply

julieyantachk

How does the magnetic flux for a generator have a varying angle between the external magnetic field & dA?

How does the magnetic flux for a generator have a varying angle between the external magnetic field & dA?

Hello,

Studying for my finals and can't seem to figure out this problem.

How does the magnetic flux for a GENERATOR have a varying angle between the external magnetic field and the area vector dA??

Thank you!

dattrussianki   497   1 Reply

JulieA

How do i figure out the Flux Density at a certain distance from a point light source?

How do i figure out the Flux Density at a certain distance from a point light source?

I've been trying to go through my book but it doesn't talk about flux density. I have to figure out the flux density at a distance of 1m of an isotropic monochromatic point light source (of frequency 10^15 Hz) that radiates at a rate of 100W.

Nursmonica   396   1 Reply

datoledo88

Which describes the magnetic flux through a section of a loop?

Which describes the magnetic flux through a section of a loop?

Which describes the magnetic flux through a section of a loop?

A. It is a vector that is directed outward through the section.
B. It is a vector that is directed inward through the section.
C. It is a vector that is tangent to the section.
D. It is

nuvydeep   422   2 Replies

SmokeyV4L

What is the electric flux through the surface of the sphere?

What is the electric flux through the surface of the sphere?

A point charge of 2 ?C is located at the center of a sphere with a radius of 21 cm. The Coulomb constant is 8.98755 × 109 Nm2/C2, and the acceleration of gravity is 9.8 m/s2. Determine the electric flux through the surface of the sphere. Answer in un

smonkey89   437   1 Reply

julietalbot6

How do I do this question about electric flux?

How do I do this question about electric flux?

The flux through a closed surface surrounding a single charge is -5.1  10^-5 N·m2/C. What is the value of the charge?

Flux is defined as Q(charge)/E0(the electric constant), correct?

So -5.1 x 10^-5 x the electric constant should be my charge?

Bu

smorgan6616   302   1 Reply

Nuwi

Which describes the vector calculation of the magnetic flux through a section of a closed Gaussian surface?

Which describes the vector calculation of the magnetic flux through a section of a closed Gaussian surface?

Which describes the vector calculation of the magnetic flux through a section of a closed Gaussian surface?

A. It is the dot product of the magnetic field and the section?s area vector.
B. It is the ratio of the magnetic field magnitude to the secti

juliemandell   467   1 Reply

smp1016

What is the reason for needle deflection in an experimental moving coil voltmeter?

What is the reason for needle deflection in an experimental moving coil voltmeter?

An experimental voltmeter is constructed from a moving coil meter and a decade box resistor.  When the meter is connected to the leads of an ohmmeter, the needle deflects up briefly. When the meter leads are reversed, the needle on the experimental v

juliem   255   1 Reply

Firedancer20

Is the tesla coil associated with the Tesla Roadster?

Is the tesla coil associated with the Tesla Roadster?

I want to know if the tesla coil technology is used in the Tesla Roadster. Please give a valid source, I am doing this for a grade. Thanks!

julietalbot6   379   1 Reply

julielpn74

How do I build a Tesla coil? How do I build a gauss cannon? Is there a way to intertwine these 2 ideas into 1?

How do I build a Tesla coil? How do I build a gauss cannon? Is there a way to intertwine these 2 ideas into 1?

I have had relatively little training in physics but I still have the feeling that a magnetically propelled projectile can attract the discharge of a tesla coil.  Please explain to me how I can build this machine.  Also, if I install a grounding wire

Firedancer20   559   2 Replies

nutjob2011

A magnet is pushed through a coil and it induces a current. Does it depend on which pole is used?

A magnet is pushed through a coil and it induces a current. Does it depend on which pole is used?

A magnet pushed through a coil and it induces a current. Does it depend on which pole is used?

Does it matter whether the north or south pole is pushed through the coil to induce the current and if so what will it do to the current? Reverse directio

datoledo88   491   3 Replies

smooth15

How do you build an induction coil?

How do you build an induction coil?

So I'd basically like to gain a little more knowledge on building a simple induction coil to perform a remedial task, such as light a small christmas lightbulb or even heat a small piece of metal?
My questions are:

What amount of current is required

nutyper   374   1 Reply

datoledo88

How to calculate the torque of a rotating shaft.?

How to calculate the torque of a rotating shaft.?

I am going to do a project on vertical axis wind turbine and its testing using different design of blades. With different blades i may get different rpm of shaft. The rpm can be measured by a digital tachometer. But to know the power we should also k

datwillis   989   1 Reply

firefighter61

What is the torque produced by the flagpole-flag combination where the pole is attached to the wall?

What is the torque produced by the flagpole-flag combination where the pole is attached to the wall?

A 1 kg flag is attached to a uniform horizontal flagpole (mass=5kg) where the flag hangs vertically. The pole is 5 meters long and the flag is attached at two points, namely the end and 1 meter from the end. What is the torque produced by the flagpol

daughterofzion   418   1 Reply

dattrussianki

what is the minimum torque required to produce the power of lkw in generator?

what is the minimum torque required to produce the power of lkw in generator?

what is the minimum torque is required in order to bring the motor to action..... what is the formula to calculated the minimum torque required ?

Nursmonica   616   3 Replies

smox89

Is there a loss of torque when extensions are applied to the socket end of a torque wrench?

Is there a loss of torque when extensions are applied to the socket end of a torque wrench?

I work on power plant turbines for a living and have heard many arguments about not using extensions or Universal joints on torque wrenches when torquing bolts.  I was wondering if there is hard evidence that agrees with or denies this claim.
If this

juliejjay   564   2 Replies

datheman

What is the magnitude of the maximum torque on the current loop?

What is the magnitude of the maximum torque on the current loop?

A current loop in a motor has an area of 0.85 cm^2. It carries a 240 mA current in a uniform field of 0.62 T. What is the magnitude of the maximum torque on the current loop?

fireflower   486   1 Reply

julie777

How do I find torque with friction loss?

How do I find torque with friction loss?

Can someone please help explain this, or give me the equation?

A double-action rotary cylinder has a van radius of 1½ inches and a vane area of 2 square inches. If the input fluid pressure is 1,250 psi and the friction loss is 25 pounds, what will b

smoutera   297   1 Reply

Datnigerian

How do I find minimum force when I know torque and length?

How do I find minimum force when I know torque and length?

"A bolt is to be tightened with a torque of 7.6 N · m. If you have a wrench that is 0.20 m long, what is the least amount of force you must exert in N?"

I thought torque was equal to length times force, but apparently force is not equal to torque di

Nutters91   336   2 Replies

smoran1

How does a car make a right turn? Where does the torque come from that is needed to change the angular?

How does a car make a right turn? Where does the torque come from that is needed to change the angular?

11-13) How does a car make a right turn?  Where does the torque come from that is needed to change the angular momentum?  
Please help, thanks!

SMOKEY2112   424   2 Replies

firebucks74

What direction is the torque caused by the gravitational force?

What direction is the torque caused by the gravitational force?

A baseball bat stands on end (handle touching the ground). When it is released, the top of the bat falls over toward the east. Treating the point where the handle touches the ground as the rotation axis, which direction is the torque caused by the gr

smokeyd   392   3 Replies

nuvydeep

What is the maximum torque developed by the motor?

What is the maximum torque developed by the motor?

A simple electric motor consists of a 110-turn coil 3.8 cm in diameter, mounted between the poles of a magnet that produces a 0.19 T magnetic field. When a 5.7 A current flows in the coil.

When a 5.7 A current flows in the coil, what is the maximum

smoran1   400   2 Replies

nuxeh

What is the torque exerted by the load upon the motor shaft?

What is the torque exerted by the load upon the motor shaft?

A 220 V electric motor produces 0.766 kW of power at 3600 RPM. Assume efficiency is 100%.

What is the torque exerted by the load upon the motor shaft?

firefighter90   633   2 Replies

nustudent83