Physics

12 years ago

What scattering angle in the Compton effect produces the minimum change in frequ

What scattering angle in the Compton effect produces the minimum change in frequency?
A) 45°
B) 90°
C) 0°
D) 180°
E) 270°

ppk 1214 1 Reply

12 years ago

If the position of an electron is measured very precisely there is an uncertaint

If the position of an electron is measured very precisely there is an uncertainty in measuring its
A) kinetic energy.
B) momentum.
C) potential energy.
D) thermal energy.
E) None of the other answers is correct.

ppk 2342 1 Reply

12 years ago

The cosmic background radiation permeating the universe has the spectrum of a 2.

The cosmic background radiation permeating the universe has the spectrum of a 2.7 K thermal radiator. What is the peak wavelength?

ppk 792 1 Reply

12 years ago

At what rate are photons emitted by a 50. W sodium vapor lamp? (Assume that the

At what rate are photons emitted by a 50. W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelength 589. nm.)

ppk 2408 1 Reply

12 years ago

A metallic surface is illuminated with light of wavelength 400. nm. If the work

A metallic surface is illuminated with light of wavelength 400. nm. If the work function for this metal is 2.4 eV, calculate the kinetic energy of the ejected electrons, in electron-volts.

ppk 1448 1 Reply

12 years ago

What primary wavelength and corresponding photon energy is emitted by a body at:

What primary wavelength and corresponding photon energy is emitted by a body at:
(a)   400.°C?
(b)   800.°C?
(c)   1200.°C?

ppk 805 1 Reply

12 years ago

Mathilda collects photoelectric data in her physics laboratory. She measures a s

Mathilda collects photoelectric data in her physics laboratory. She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm.
(a) What is the work function for the material in eV?
(b) Fr

ppk 1042 1 Reply

12 years ago

wave

out in the ocean, a wave crest meets a wave trough from another direction which is 2.6m deep.How high is the resultant wave?

haitran503 669 1 Reply

tink571937

12 years ago

A 140. KeV photon strikes an electron and scatters through an angle of 120.° (a)

A 140. KeV photon strikes an electron and scatters through an angle of 120.°
(a) What is the wavelength of the photon before scattering?
(b) What is the photon wavelength after scattering?

ppk 945 1 Reply

12 years ago

toms in crystals are typically separated by distances of 0.10 nm. What KE must a

Atoms in crystals are typically separated by distances of 0.10 nm. What KE must an electron have, in eV, in order to have a wavelength of 0.10 nm?

ppk 597 1 Reply

12 years ago

What is the number of photons per second given off by a light bulb with a power

What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm.
A) 6.34 × 1018 photons/s
B) 5.42 × 1018 photons/s
C) 3.11 ×

ppk 1598 1 Reply

12 years ago

A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photon

A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given off by the bulb assuming the wavelength of light to be 580 nm?
A) 5.42 × 1018 photons/s
B) 10.8 × 1018 photons/s
C) 16.2 × 1018 photons/

ppk 1956 1 Reply

12 years ago

What is the surface temperature of a star, given that its radiation peak occurs

What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.06 × 1015 Hz?
A) 17,000 K
B) 14,500 K
C) 19,000 K
D) 20,400 K
E) 18,000 K

ppk 2294 1 Reply

12 years ago

A 2.00 kg mass is attached to a spring with a spring constant of 48.0 N/m. If th

A 2.00 kg mass is attached to a spring with a spring constant of 48.0 N/m. If the maximum speed of the mass in this system is 1.14 m/s, what is the energy of the quanta of energy in this system?
A) 2.23 × 10-34 J
B) 6.63 J
C) 6.63 × 10

ppk 2103 1 Reply

12 years ago

Which one of the following is correct for the energy of a 620 nm beam of light?

Which one of the following is correct for the energy of a 620 nm beam of light?
A) 1.60 × 10-19 eV
B) 2.10 × 10-19 J
C) 3.21 × 10-19 J
D) 1.60 × 10-18 eV
E) 3.21 × 10-18 eV

ppk 1106 1 Reply

12 years ago

What is the cutoff frequency for a metal surface that has a work function of 5.4

What is the cutoff frequency for a metal surface that has a work function of 5.42 eV?
A) 1.31 × 1015 Hz
B) 2.01 × 1015 Hz
C) 3.01 × 1015 Hz
D) 5.02 × 1015 Hz
E) 6.04 × 1015 Hz

ppk 2502 1 Reply

12 years ago

A photon has energy of 4.20 eV. To what wavelength does this energy correspond?

A photon has energy of 4.20 eV. To what wavelength does this energy correspond?
A) 321 nm
B) 103 nm
C) 296 nm
D) 412 nm
E) 420 nm

ppk 2291 1 Reply

12 years ago

What is the energy of a photon with a frequency of 6.60 × 1015 Hz?

What is the energy of a photon with a frequency of 6.60 × 1015 Hz?
A) 27.3 eV
B) 12.3 eV
C) 18.1 eV
D) 19.6 eV
E) 6.60 eV

ppk 2280 1 Reply

12 years ago

The work function of a certain metal is 1.90 eV. What is the longest wavelength

The work function of a certain metal is 1.90 eV. What is the longest wavelength of light that can cause photoelectron emission from this metal?
A) 231 nm
B) 14.0 nm
C) 62.4 nm
D) 344 nm
E) 653 nm

ppk 1392 1 Reply

12 years ago

Light with a wavelength of 310 nm is incident on a metal that has a work funct

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
A) 0.62 × 10-19 J
B) 0.21 × 10-19 J
C) 0.36 × 10-19

ppk 1408 1 Reply

12 years ago

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is inc

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the range of frequencies in this beam of light that will be responsible for ejecti

ppk 1254 1 Reply

12 years ago

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is inc

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface?
A) 0.

ppk 970 1 Reply

12 years ago

A beam of white light of a certain frequency is incident on a metal surface. If

A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?

ppk 1046 1 Reply

12 years ago

What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz?

What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz?
A) 1.5 × 10-28 kg?m/s
B) 2.1 × 10-28 kg?m/s
C) 4.4 × 10-28 kg?m/s
D) 6.3 × 10-28 kg?m/s
E) 6.2 × 10-28 kg?m/s

ppk 1363 1 Reply

12 years ago

What is the momentum of a photon of light that has a wavelength of 480 nm?

What is the momentum of a photon of light that has a wavelength of 480 nm?
A) 1.1 × 10-27 kg?m/s
B) 2.2 × 10-27 kg?m/s
C) 1.8 × 10-27 kg?m/s
D) 1.4 × 10-27 kg?m/s
E) 2.0 × 10-27 kg?m/s

ppk 907 1 Reply

12 years ago

Biophysics-Spectrophotometer Principles ?

What is spectrometer or spectrophotometer?

What are the components of spectrometers?

how it works ?

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xjpx90

12 years ago

Which one of the following is true for the wavelength of the photon emitted when

Which one of the following is true for the wavelength of the photon emitted when an electron in a hydrogen atom jumps from the ni = 70 state to the nf = 2 state as compared to the wavelength of the photon emitted when the electron jumps from the ni =

ppk 1008 1 Reply

12 years ago

What is the energy of a photon that, when it is absorbed by a hydrogen atom, exc

What is the energy of a photon that, when it is absorbed by a hydrogen atom, excites an electron from the ground state of the hydrogen atom to the n = 2 state?
A) 10.2 eV
B) 1.63 × 10-18 J
C) 1.63 × 10-18 Nm
D) All of the answers

ppk 660 1 Reply

12 years ago

The orbital angular momentum quantum number can take which of the following valu

The orbital angular momentum quantum number can take which of the following values for any given value of the principal quantum number, n?
A) ? = 0, 1, 2, . . .
B) ? = 0, 1, 2, . . . , n
C) ? = 0, 1, 2, . . . , (n - 1)
D) ? = 1, 2

ppk 1597 1 Reply

12 years ago

According to the quantum mechanical model of the hydrogen atom, if the principal

According to the quantum mechanical model of the hydrogen atom, if the principal quantum number is n, how many different orbital angular momentum quantum number(s) are permitted?
A) n/2
B) n
C) 2n
D) 3n
E) 4n

ppk 1227 1 Reply

12 years ago

According to Pauli's exclusion principle, how many electrons in an atom may have

According to Pauli's exclusion principle, how many electrons in an atom may have a particular set of quantum numbers?
A) 1
B) 3
C) 2
D) 4
E) 5

ppk 1297 1 Reply

12 years ago

Which one of the following is the correct electronic configuration for carbon? A

Which one of the following is the correct electronic configuration for carbon?
A) 1s2 2s2 2p2
B) 1s1 2p1
C) 1s1 2s2 2p1
D) 1s1 2s1 2p1
E) 1s2 2s2 2p4

ppk 918 1 Reply

12 years ago

Which one of the following is the correct electronic configuration for the sodiu

Which one of the following is the correct electronic configuration for the sodium atom?
A) 1s1 2s2 3p6 2s2
B) 1s2 2s1 3p6 2s2
C) 1s1 2s2 2p6
D) 1s2 2s2 2p6 3s2
E) 1 s2 2 s2 2 p6 3 s1

ppk 675 1 Reply

12 years ago

n principle, a hologram is a result of which of the following properties of ligh

n principle, a hologram is a result of which of the following properties of light?
A) Transmission
B) Interference
C) Refraction
D) Reflection
E) Dispersion

ppk 2071 1 Reply

12 years ago

What type of spectrum is produced when a high energy electron beam is incident o

What type of spectrum is produced when a high energy electron beam is incident on a metal target producing X-rays?
A) line spectrum
B) emission spectrum
C) absorption spectrum
D) continuous spectrum
E) line spectrum superimpo

ppk 1396 1 Reply

12 years ago

Which one of the following properties of the beam of light applies to a laser be

Which one of the following properties of the beam of light applies to a laser beam?
A) It is coherent.
B) It is incoherent.
C) It is diverging.
D) It is converging.
E) None of the other answers given is correct.

ppk 1955 1 Reply

12 years ago

The emission of light of lower frequency after illumination by a higher frequenc

The emission of light of lower frequency after illumination by a higher frequency is referred to as
A) absorption.
B) stimulated emission.
C) coherence.
D) phosphorescence.
E) fluorescence.

ppk 2210 1 Reply

12 years ago

Consider the Bohr Theory Hydrogen atom in the 2 nd excited state. (a)Determine

Consider the Bohr Theory Hydrogen atom in the 2 nd excited state.
(a)   Determine the binding energy (eV) of the electron.
(b)   What is the radius of the electron orbit?
(c)   How far is it from the next higher excited orbit?

ppk 827 1 Reply