Earth's stratosphere is heated primarily by which process?
A) Convection from the Earth's surface.
B) Absorption of infrared radiation by greenhouse gases.
C) Absorption of visible light by ozone.
D) Absorption of ultraviolet radiation by ozone.
E) Atoms and molecules absorb infrared sunlight.
D
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Monochromatic light falls on a metal surface and electrons are ejected. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons?
A) greater rate; same maximum energy. B) same rate; greater maximum energy. C) same rate; same maximum energy. D) greater rate; greater maximum energy.
Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ?s. When the speed of the turntable is gradually increased,
a. only the lighter container slides outward off the turntable; the heavier one stays on. b. only the heavier container slides outward off the turntable; the lighter one stays on. c. both containers slide off the turntable at the same turntable speed. d. the lighter container slides inward. e. the heavier container slides inward.
A 200-Hz and a 206-Hz sound are emitted into the same volume of space. What is the frequency of intensity variation?
A) 406 Hz B) 41.2 kHz C) 6 Hz D) 1.03 Hz E) 203 Hz
The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass, length, time) is which of the following?
a. MLT c. MLT-1 b. ML2T-2 d. MLT-2