Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) timing (measuring how the amount of light changes with time)
B) imaging (taking a picture)
C) spectroscopy (taking a spectrum)
C
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The region of the electromagnetic spectrum with frequencies just greater than those in the ultraviolet region is the ______________ region
a. x-rays b. radio waves c. microwaves d. infrared e. gamma rays
The lunar surface cools after the sun sets. This is an example of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above
The only force acting on a 2.0-kg body moving along the x axis is given by Fx = (2.0x) N, where x is in m. If the velocity of the object at x = 0 is +3.0 m/s, how fast is it moving at x = 2.0 m?
a. 4.2 m/s b. 3.6 m/s c. 5.0 m/s d. 5.8 m/s e. 2.8 m/s
Raising the temperature of air will
1.decrease the speed of sound in the air. 2.increase the speed of sound in the air. 3.not affect the speed of sound in the air. 4.sometimes increase and sometimes decrease the speed of sound in air.