When a fixed amount of ideal gas goes through an isothermal expansion,
A) its internal (thermal) energy does not change.
B) the gas does no work.
C) no heat enters or leaves the gas.
D) its temperature must decrease.
E) its pressure must increase.
Answer: A
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A thin film appears yellow when illuminated with white light. The color being cancelled by destructive interference is
A) red. B) green. C) white. D) blue. E) none of the above
A two-slit arrangement with 60.3 ?m separation between the slits is illuminated with coherent light. If a viewing screen is located 2.14 m from the slits,
find the distance from the first dark fringe on one side of the central maximum to the second dark fringe on the other side. A) 52.3 mm B) 34.9 mm C) 69.7 mm D) 24.6 mm
A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit. b. squint while looking in that direction. c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. e. reflect the rays from that direction on a shiny metal surface.