Question

Two electrons are ejected in opposite directions from radioactive atoms in a sample of radioactive material. Let c denote the speed of light. Each electron has a speed of 0.67 c as measured by an observer in the laboratory. Their relative velocity is given by ______.

Options

• 1.34 c

• 1.19 c

• 0.92 c

• 0.87 c

Answer 1

Two electrons are ejected in opposite directions from radioactive atoms in a sample of radioactive material. Let c denote the speed of light. Each electron has a speed of 0.67 c as measured by an observer in the laboratory. Their relative velocity is given by 1.34 c.

Explanation:

Vrel = `"V"_2 - "V"_1 = .67 "C" - (- .67 "C")` = 1.34 C