The Sun formed from the gravitational collapse of a cold ________.
A. interstellar cloud
B. red giant
C. planet
D. planetary nebula
Answer: A
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Weight and g: The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satellite's weight at the altitude of its orbit?
A. 61 N B. 110 N C. 9000 N D. 16,000 N
Photoelectric Effect: What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.31 × 1015 Hz B. 2.01 × 1015 Hz C. 3.01 × 1015 Hz D. 5.02 × 1015 Hz E. 6.04 × 1015 Hz
If a guitar string has a fundamental frequency of 512 Hz, what is the frequency of its first overtone?
a. 511 Hz b. 256 Hz c. 510 Hz d. 1 020 Hz e. 513 Hz
To analyze single-slit diffraction, what new assumption not made in the Young double-slit experiment must be made?
1.Each portion of the slit acts as a source of light waves. 2.The light's wavelength is at the red end of the spectrum. 3.Interference effects can be ignored. 4.The distance between the slit and the screen is much greater than the wavelength of the light.