A sound with a frequency of 1000 Hz is in the ______________ region of the sound spectrum
a. infrasonic
b. ultrasonic
c. audible
d. visible
c
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In some cases, we have seen extrasolar planets pass in front of their stars
Indicate whether the statement is true or false
According to Einstein, gravity is
A) the bending of space that is caused by masses. B) the force that masses exert on each other. C) caused by the electromagnetic force. D) due only to velocity. E) due only to acceleration.
Why do stars twinkle?
A. due to their movement across the sky B. due to the refraction caused by atmospheric irregularities C. due to rapid changes occurring on their surfaces D. due to imperfections in the human eye
Regions of Earth where the Sun is more directly overhead will experience ________.
A. colder weather B. warmer weather C. more eclipses D. longer nights E. None of these choices is correct.