The type of detector that uses a magnetic field to curve charged particles is a
A)
Geiger tube.
B)
scintillation counter.
C)
cloud chamber.
D)
bubble chamber.
E)
spark chamber.
D
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Lens-Maker Formula: The radius of curvature of the curved side of a plano-convex lens made of glass, having index of refraction 1.64, is 33 cm. What is the focal length of the lens?
A. 52 cm B. -52 cm C. 21 cm D. -21 cm
Gasoline can be used to power cars because it has
A) gravitational potential energy. B) chemical potential energy. C) electrical potential energy. D) kinetic energy. E) radiative energy.
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 65.7 W B) 60.3 W C) 64.8 W D) 68.4 W E) 62.6 W
Camera Exposure: A lens of focal length 45 mm is mounted on a 35-mm camera. The lens aperture is set at f/2.0 and the shutter speed set at 1/2000 s. The photographer wants to keep the same exposure (amount of light), but wants to change the f-number to f/8.0 for greater depth of field. What should be the new shutter speed to maintain the same exposure?
A. 1/1000 s B. 1/500 s C. 1/4000 s D. 1/8000 s E. 1/125 s