You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway
When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the frequency of the siren? The speed of sound in air is 343 m/s. A) 1850 Hz
B) 2000 Hz
C) 2050 Hz
D) 2010 Hz
E) 1980 Hz
B
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How can astronomers currently determine the temperature of an extrasolar planet?
A) estimate the temperature based on the planet's distance from the star B) measure the drop in total infrared light when the planet passes behind the star from our perspective C) use spectroscopy of the planet to identify the wavelength at which its emission peaks D) A and B E) B and C
When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases. b. decreases. c. stays the same. d. becomes more quantized. e. becomes less quantized.
In twice the time, an object will fall
A) 16 times as far. B) 12 times as far. C) four times as far. D) twice as far. E) eight times as far.
Which of the following statements correctly describes the motion of the particles in Saturn’s rings?
a. Particles in all the rings hover motionlessly high above Saturn. b. Particles in the inner rings orbit Saturn at a faster speed than particles in the outer rings. c. Particles in the inner rings orbit Saturn at a slower speed than particles in the outer rings. d. All the particles in the rings orbit Saturn with the same orbital period.