What generally causes clouds to form?
A) falling relative humidity
B) sinking of saturated air
C) lifting of air
D) addition of water vapor
Answer: C
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The principal refraction of light by the eye occurs at the
A) cornea. B) lens. C) sclera. D) iris. E) retina.
A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the maximum speed of the photoelectrons emitted?
A) 1.0 × 106 m/s B) 1.3 × 106 m/s C) 7.0 × 105 m/s D) 7.7 × 105 m/s E) 3.5 × 106 m/s
The star Alpha Centauri A is the same type of star as the Sun, but its luminosity is about 1.6 times that of the Sun. What can we conclude?
A) Alpha Centauri A must have a vastly different interior structure than the Sun. B) Alpha Centauri A fuses hydrogen into helium in its core at a higher rate than our Sun. C) Alpha Centauri A has a much higher surface temperature than the Sun. D) Alpha Centauri A is much farther from Earth than the Sun.
It can be concluded from Gauss's law for magnetism that
A) south magnetic poles do not exist. B) isolated magnetic poles sometimes exist. C) north magnetic poles do not exist. D) magnetic poles are pairs of electric charges. E) isolated magnetic poles do not exist.