Electrons got ejected out as if they were ping pong balls by the light particle (photon). Electrons were not moving initially. Then, it was moving later because of the light.
a. what is the momentum of the electron initially (p=mv) Hint: Is it moving initially?
b. does the electron have momentum after being hit by the light particle? Hint: is it moving after being hit?
c. what can you infer about light particles in momentum? Hint: where is the electron getting its velocity from?
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Ответ:
(12 meter/second) (60 sec/minute) (15 minutes) =
(12 60 15) (meter second minute / second minute) =
10,800 meters (10.8 km, about 6.7 miles)
Note: This question doesn't represent a real-world situation. Usain Bolt's best time for 100 meters ... the current world record ... is a speed of 10.4 m/s !