Energy and Mass: The total energy of a moving electron is 0.758 MeV. What is the speed of the electron in terms of c? The mass energy of an electron is 0.511 MeV.

A. 0.739 c
B. 0.794 c
C. 0.306 c
D. 0.933 c


Answer: A

Physics & Space Science

You might also like to view...

A rock, released at rest from the top of a tower, hits the ground after 3.5 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)

a. 34 m/s b. 17 m/s c. 44 m/s d. 68 m/s e. 24 m/s

Physics & Space Science

Which of the following properties of the Sun tells us the rate at which energy is being generated in its core?

A) surface temperature B) apparent brightness C) mass D) luminosity

Physics & Space Science

At what minimum rate is a 60.0-kg boy using energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?

A) 75.0 W B) 735 W C) 4.80 kW D) 48.0 W

Physics & Space Science

A meterstick is shot from a meterstick projector at a speed of 0.90 c. How long will it be relative to an observer's frame of reference?

a. 2.3 m b. 0.91 m c. 1.0 m d. 0.44 m e. 0.81 m

Physics & Space Science