The second most abundant gas in the atmosphere is
a. oxygen.
b. nitrogen.
c. water vapor.
d. carbon dioxide.
[Ques. 2] Microwave ovens work mainly by exciting molecules of the substance named ______________.
Fill in the blank(s) with correct word
[Ques. 3] A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 T
b. 61 T
c. 43 T
d. 81 T
e. 1.4 T
[Ques. 4] The most abundant gas in the atmosphere is
a. oxygen.
b. nitrogen.
c. water vapor.
d. carbon dioxide.
[Ques. 5] The X in X-ray stands for ______________.
Fill in the blank(s) with correct word
[Ques. 6] A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm. A long wire carries a current of 2.0 A along the axis of the solenoid. What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?
a. 78 T
b. 55 T
c. 48 T
d. 68 T
e. 2.0 T
[Ques. 7] Determine the distance to Proxima Centauri in light-years, if it is 1.3 pc away.
[Ques. 8] A useful instrument that makes use of the wavelike properties of electrons is the electron ______________.
Fill in the blank(s) with correct word
[Ques. 9] A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
a. 0.60 mT
b. 0.85 mT
c. 52 T
d. 0.40 mT
e. 0.75 mT
[Ques. 10] Proxima Centauri, the nearest star to the Sun, exhibits an annual parallax of 0.76 arcsec. Determine the distance to Proxima Centauri in parsecs.
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