If the wavelength of a photon in vacuum is the same as the de Broglie wavelength of an electron, which one is traveling faster through space?
A) The electron because it has more mass.
B) The photon because photons always travel through space faster than electrons.
C) They both have the same speed.
B
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Two lights are 1000 ns apart along a stretch of railway track. In the ground frame, the west light flashes 600 ns before the east light flashes. Could these flashes be simultaneous in the frame of a train moving along the track at a certain speed (that is less than the speed of light)?
A. Yes, if the train is moving east at the correct speed. B. Yes, if the train is moving west at the correct speed. C. Yes, if the train observer happens to be at the right distances from the lights when receiving their flashes. D. No, the flashes cannot be simultaneous in any frame.
As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
a.
, where n is a positive integer.
b.
A laser beam is shown through a grating and the first-order maximum is produced at 
What is the highest order maximum that can be produced by this arrangement?
A. 2 B. 3 C. 4 D. 5 E. 6