The spacing between reflecting planes in a crystal is 2.82 × 10^-10 m. A beam of X-rays is strongly reflected at an angle of 160° with the crystal face. What is the wavelength of the X-rays?
1.55 × 10^-10 m
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A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
A. 36 ?V B. 18 ?V C. 31 ?V D. 24 ?V E. 21 ?V
A helium-neon laser emits red light having a wavelength of 6.4 × 10^-7 m and a power of 0.5 mW. How many photons are emitted each second?
a. 6.4 × 10^38 b. 1.6 × 10^21 c. 3.2 × 10^25 d. 2.6 × 10^18 e. 1.6 × 10^15
If water vapor were released from Venus's surface because of tectonic activity into its upper atmosphere, what would most likely happen to it?
a. The water vapor would relieve the greenhouse effect and decrease Venus's surface temperature. b. Water droplets would condense into rain and form lakes on Venus's surface. c. The water vapor would chemically react with carbon dioxide and form acid rain. d. UV light would break apart the water molecules, and the hydrogen would be lost into space. e. It would rise into the atmosphere and form hurricane-like storms.
Which of the following is not one of the basic properties by which we classify a subatomic particle?
A) mass B) charge (electrical) C) spin D) temperature