The A in AM radio stands for
A) acceleration.
B) authorized.
C) amplitude.
D) agony.
E) almost.
Answer: C
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Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
What range of astronomical distances can we currently measure using Hubble's law?
What will be an ideal response?
A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 2.8 × 1018 B) 6.9 × 1019 C) 3.4 × 1019 D) 1.1 × 1017 E) 2.2 × 1017
Which of the following statements about apparent and absolute magnitudes is true?
A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth. B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2. D) The absolute magnitude of a star is another measure of its luminosity. E) All of the above are true.