In which of these media can a transverse mechanical wave travel?
a. air under atmospheric pressure
b. water
c. stretched rope
d. vacuum
e. helium
c
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The main form of radiation that our bodies emit is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. blackbody.
A grating has 5150 lines per centimeter ruled on it
What is the angular separation between the first- and the third-order bright spots on the same side of the central maximum when the grating is illuminated by a beam of light with wavelength 633 nm?
Kirkwood gaps in the asteroid belt occur at distances where
A) the density of asteroids is high enough for a large collision to pulverize a number of asteroids. B) the period of an orbiting asteroid would be a simple fraction (like 1/3 or 1/4 ) of Jupiter's orbital period. C) the period of an orbiting asteroid would be the same as Mars's orbital period. D) the orbit would take the asteroid beyond the "frost line" in the solar system. E) the period of an orbiting asteroid would be the same as Jupiter's orbital period.
An ancient building was known to have been built 3 000 years ago. Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of 14C = 5 730 years)
a. 0.425 b. 0.500 c. 0.517 d. 0.696