Which of the following will emit an EM wave? Choose all thatapply. 1 A neutron t

Question

Which of the following will emit an EM wave? Choose all thatapply.

1 A neutron that is stationary.A neutrino that is speeding up from 1000m/s to 1200 m/s. Anelectron that is slowing down from 500 km/h to 400 km/h.A proton moving at a constant velocityof 60 mph due north. Anion moving in a circle while traveling at a constant speed of 20in/min. 1 A neutron that is stationary.A neutrino that is speeding up from 1000m/s to 1200 m/s. Anelectron that is slowing down from 500 km/h to 400 km/h.A proton moving at a constant velocityof 60 mph due north. Anion moving in a circle while traveling at a constant speed of 20in/min. 1 A neutron that is stationary.A neutrino that is speeding up from 1000m/s to 1200 m/s. Anelectron that is slowing down from 500 km/h to 400 km/h.A proton moving at a constant velocityof 60 mph due north. Anion moving in a circle while traveling at a constant speed of 20in/min. 1

Explanation / Answer

EM waves are caused by accelerating charge, whatever the form. So you are definitely correct about d and e. electrons and protonsare definitely charged and a change in speed (speeding up, oraccelerating in circular motion) is an acceleration. So the only real question to ask is: Does it have charge and is itaccelerating? An ion HAS charge, that's why it's called an ion...it's ionized(meaning electrons have been knocked off or put on). Clearly it'saccelerating, since it's slowing down, so yes a is alsocorrect. In some sense a neutron could be considered a charged particle(since it's theoretically made up of charged pieces) but eitherway, in this question is moving @ constant velocity, so it's NOTaccelerating = no EM wave. A neutrino is an elementary neutralparticle, so it cannot emit EM waves (it CAN interact withelectrons to emit EM waves though) b,c,e

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