A sound level of 80 dB has ___________ the amplitude of a 60 dB sound
a. ten times c. one tenth
b. twenty times d. twice
A
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If the Hubble constant is 25 km/s per million light-years, use it to estimate the age of the universe? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 15 Gy B) 10 Gy C) 20 Gy D) 12 Gy E) 25 Gy
A certain crystal has an interatomic spacing of 0.442 nm. A beam of neutrons moving with a speed of 1640 m/s is diffracted from the crystal. What is the de Broglie wavelength of the neutron?
A) 0.121 nm B) 0 nm C) 0.241 nm D) 0.484 nm E) 0.682 nm
Heavy snow showers along the western slopes of the Rockies are most likely caused by a
A) continental tropical air mass. B) maritime tropical air mass. C) continental polar air mass. D) maritime polar air mass.
Which statement about asteroids is not true?
A) If we could put all the asteroids together, they would make an object about the size of Earth. B) Many but not all orbit the Sun in the asteroid belt. C) Some are more like loosely bound piles of rubble than solid chunks of rock. D) Most asteroids are not spherical in shape.