The wavelength in air (temperature of 20°C) of a sound wave of frequency 0.50 kHz is
A) 0.68 m.
B) 0.75 m.
C) 2.0 m.
D) 1.5 m.
E) 1.8 m.
A
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When an air mass passes from a maritime source region to a warmer continental region, heating from the warmer land causes
A) frontal lifting. B) orographic lifting. C) convectional lifting. D) adiabatic lifting.
The footprints left on the moon by the Apollo astronauts will likely last for
A) millions of years. B) no time; they were quickly erased by micrometeorites. C) the remaining existence of the Moon. D) a few decades.
An electron has a speed of 0.643c. Through what potential difference would the electron need to be accelerated (starting from rest) in order to reach this speed? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 160 kV B) 200 kV C) 130 kV D) 180 kV
How much kinetic energy does a 0.30-kg stone have if it is thrown at 44m/s
A) 290 J B) 580 J C) 440 J D) 510 J