According to relativity theory a particle of mass m with a momentum of 2mc has a speed of:
A)4c
B)2c
C)c
D)0.89c
E)c/2

Name: According to relativity theory a particle of mass m with a momentum of 2mc has a speed of: A)4c B)2c C)c D)0.89c E)c/2
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Question

Quizplus · Accepted Answer

According to special relativity, the momentum of a particle with mass m and speed v is given by p = mv/√(1-v^2/c^2). Here, p = 2mc. Solving for v gives v = 0.89c. Therefore, the correct answer is D.

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