Which of the following will emit an EM WAVE? Choose all that apply. a. A proton moving in a circle while traveling at a constant speed of 20 in/min. b. An electron moving at a constant velocity of 60 mph due north. c. An ion that is stationary. d. A neutrino that is speeding up from 1000 m/s to 1200 m/s. e. A neutron that is slowing down from 500 km/h to 400 km/h.

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.