A sound wave in air has an intensity of
The density of air is
and the velocity of sound in air is 331 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
D.
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In keeping with its Greek god, Neptune probably contains a lot of water, in a slushy mantle ocean
Indicate whether the statement is true or false
If the Hubble parameter is 25 km/s per million light years, how old is the universe?
A) 10 × 109 y B) 12 × 109 y C) 15 × 109 y D) 20 × 109 y E) 25 × 109 y
The deflection of air and ocean currents from their original direction of motion due to the rotation of Earth is called ________.
A. differentiation B. precession C. revolution D. the Coriolis effect E. circulation
A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction grating with a slit spacing of 1.70 × 10-4 cm. What is the angle for the first order maximum?
A) 10.5° B) 12.1° C) 16.4° D) 18.2° E) 20.7°