A person standing in the street is unaware of a bird dropping that is falling from a point directly above him with increasing velocity. If the dropping were producing sound of a fixed frequency, as it approaches the person would hear the sound
a. drop in frequency.
b. stay at the same frequency.
c. increase in frequency.
d. decrease in loudness.
e. stay at the same loudness.
c
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Which of the following is true of Saturn's moon Enceladus?
A) It is rich in organic molecules. B) It has been warmed by tidal heating. C) It has plentiful liquid water necessary for the rise of life. D) It is airless so any form of water would boil away into space.
The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. The near-point distance of the person using the microscope is 25.0 cm
If the microscope is focused on a small object, what is its final magnification? A) -44 B) -66 C) -77 D) -88 E) -100
What processes are involved in the sunspot cycle?
A) gravitational contraction of the Sun B) wave motions in the solar interior C) variations of the solar thermostat D) the winding of magnetic field lines due to differential rotation E) the interaction of the Earth's magnetic field with that of the Sun
The quantity that is quantized in the oscillating atoms of a blackbody is
a. angular momentum. b. energy. c. the emission spectrum. d. the absorption spectrum. e. the wave function.