A photon hitting an electron (mass m) at rest can create an electron–antielectron pair in addition to the original electron. Assume that the two electrons and the positron move away from the collision at rest with respect to each other afterward. What was the photon’s initial energy?
A. Zero
B. m
C. 2m
D. 3m
E. 4m
E. 4m
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Molecular Speeds: A flask contains a mixture of argon and neon gases at a stabilized temperature. The root-mean-square speed of the argon gas is determined to be 1.21 km/s. What is the root-mean-square speed of the neon gas? The atomic mass of argon is 39.95 g/mol, and that of neon is 20.18 g/mol.
Fill in the blank(s) with the appropriate word(s).
Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration
A) is less than it will be a short instant later. B) is zero. C) reverses direction. D) is g. E) is 2?g.
The geographical area that contributes groundwater and runoff to any particular stream is called the ?
What will be an ideal response?
Comets are made mostly of
A) rock. B) hydrogen gas. C) rock and metal. D) metal. E) rock and ice.