What is light?
A. Light is radiant energy in the form of a wave of electromagnetic energy.
B. Light is radiant energy that can be mathematically treated as a wave or particle of energy.
C. Light is radiant energy in the form of a stream of energy particles, called photons.
D. None of these choices are correct.
Answer: B
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Which main sequence stars have the shortest lifetimes?
A) spectral type M B) spectral type G C) spectral type O D) spectral type A E) can't tell from information provided
A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship
What is the speed of the missile measured by observers on the earth if the missile is fired (a) away from the earth? (b) toward the earth?
The nuclear force is:
a. weaker than the electromagnetic force. b. almost independent of charge. c. long range. d. stronger with positively charged particles. e. always negatively charged.
A nucleus undergoes radioactive decay, emitting a gamma ray. Which of the following statements is true?
A. A nuclear proton changes into an electron-positron pair. B. Both daughter and parent nuclei have the same atomic number. C. The daughter nucleus is more massive than the parent. D. The daughter nucleus has more neutrons than the parent.