The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m
b. 0.0000034 m
c. 0.00034 m
d. 0.34 m
e. 340,000,000 m
C
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P-waves travel faster through the inner core than the outer core because the inner core is
A) hotter than the outer core. B) the same as the outer core. C) rock. D) solid.
How is the energy stored in a current-carrying inductor related to the current value, I?
a. directly proportional to I1/2 c. inversely proportional to I b. directly proportional to I2 d. directly proportional to I
Two point charges, initially 2.0 cm apart, experience a 1.0-N force. If they are moved to a new separation of 8.0 cm, what is the electric force between them?
A) 2.0 N B) 4.0 N C) 16 N D) 1/4 N E) 1/16 N
If air were a better conductor than it is, nighttimes on Earth would be
A) considerably colder. B) considerably warmer. C) not appreciably different in temperature.