If I0 = 10?12 W/m2 is the threshold of hearing, a sound with intensity I1 = 10?11 W/m2 will give a certain decibel level. Suppose a new sound has an intensity I2 = 2I12/I0 . What is the new decibel level?
a. 2.3 dB
b. 23 dB
c. 100 dB
d. it will square the decibel level
e. 1.0 dB
b
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If a star is found with five planets orbiting it, and a process like that described in the solar nebula theory formed the planets, which of the planets would be expected to have the greatest uncompressed density?
a. The one farthest from the star. b. The one with the greatest mass. c. The one with the greatest radius. d. The one closest to the star. e. The one that has liquid water on its surface.
The Search for Extraterrestrial Intelligence (SETI) program currently involves
A) broadcasting signals for other advanced civilizations to receive B) listening for signals broadcast by advanced civilizations C) searching for life on planets around other stars D) searching for life in our solar system
A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse. B) Mars and Jupiter. C) the Moon in its monthly cycle. D) Jupiter and Saturn. E) Mercury and Venus.
If two vectors are perpendicular to each other, their cross product must be zero
A) True B) False