If the Moon is rising at midnight, the phase of the Moon must be
A) full.
B) first quarter.
C) third quarter.
D) waning crescent.
E) waxing crescent.
C) third quarter.
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Most of the visible light we see coming from the Sun originates from the
a. chromosphere. b. photosphere. c. corona. d. sunspots. e. magnetic field.
Light from a laser is
1) monochromatic. 2) in phase. 3) coherent. 4) all of the above. Compared to the energy put into a laser, the energy of the laser beam is 5) usually much more. 6) much less. 7) the same.
A laser with a power of 1.0 mW has a beam radius of 1.0 mm
What is the peak value of the electric field in that beam? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 490 V/m B) 22 V/m C) 65 V/m D) 840 V/m E) 120 V/m
The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun
A) when momentum is conserved. B) because velocity is conserved. C) when both velocity and momentum are conserved. D) if the masses of the bullet and gun are equal. E) none of the above