Since the rest energy of an electron and its antiparticle a positron is 0.511 MeV, a gamma ray must have an energy larger than 1.022 MeV to produce an electron-positron pair
Indicate whether the statement is true or false
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Physics & Space Science
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The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light. b. equal to the speed of light. c. much larger than the speed of light. d. irrelevant since nothing (including light) can escape from a black hole.
Physics & Space Science
What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg) with a period of 5.0 h?
a. 88 N b. 55 N c. 36 N d. 98 N e. 18 N
Physics & Space Science
A lepton interacts via the strong interaction
Indicate whether the statement is true or false
Physics & Space Science
A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?
A) 34°C B) 36°C C) 40°C D) 38°C
Physics & Space Science