A typical microwave oven operates at a frequency of 2.45 GHz. What is the wavelength associated with the electromagnetic waves in the oven?
1.8.20 m
2.12.2 cm
3.1.20 × 108 m
4.8.20 × 10-9 m
5.none of those answers
2
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Which of the following is TRUE?
A. Mercury has a very thick atmosphere made mostly of carbon dioxide. B. Venus has no volcanos on its surface. C. Mercury rotates exactly one and a half times for every one revolution around the Sun. D. The runaway greenhouse effect causes the present temperatures on Mars to exceed those on Earth. E. The average surface temperature of Venus is about 30 degrees Fahrenheit.
A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is
a. 0.25 psi. b. 0.5 psi. c. 2 psi. d. 4 psi. e. none of the above.
The dome of water associated with a hurricane making landfall is called a(n) ______________
Fill in the blank(s) with correct word
A crystal is irradiated with x-rays with a wavelength of 0.120 nm. The atomic planes in the crystal are separated by 0.21 nm. At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?
A) only 73° B) only 55° C) only 73° and 31° D) 73°, 55°, 31°