A.) Which of the following will emit an EM wave? Choose all that apply. _____A n

Question

A.) Which of the following will emit an EM wave? Choose all that apply.

_____A neutron that is slowing down from 950 mph to 700 mph.
_____ A proton that is stationary.
_____ A neutrino that is speeding up from 20 in/h to 45 in/h.
_____An ion moving at a constant velocity of 25 m/s due west.
_____An electron moving in a circle while traveling at a constant speed of 620 yd/min.


B.) In which of the following will you (the observer) hear a HIGHER frequency than what the source is emitting? Choose all that apply.

____A police car with its siren on is moving towards you while traveling 110 mph. You are moving away from it while traveling 100 mph.
____A fire truck with its siren on is circling you. You are stationary.
____An ambulance with its siren on is moving away from you while traveling 90 km/h. You are moving towards it while traveling 90 km/h.
_____A train with its horn blaring is stationary. You are stationary.
_____ A marching band playing the 1812 Overture is moving towards you while traveling 90 ft/s. You are moving away from it while traveling 100 ft/s.

C.) Which one of the following best describes how a generator works?

____It turns electrical energy into KE.
___ It turns sound energy into electrical energy.
____ It turns electrical energy into sound energy.
____It turns electrical energy into thermal energy.
____ It turns KE into electrical energy.

Explanation / Answer

just An electron moving in a circle while traveling at a constant speed of 620 yd/min.

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