To see the Sun's hot corona (a temperature of 1,000,000 K), which part of the electromagnetic spectrum should one observe?
A) the visible
B) the X-ray
C) the ultraviolet
D) the radio
E) the infrared
B
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What elements do astronomers consider heavy elements?
A) all elements besides hydrogen and helium B) elements that are heavier than iron C) elements that are heavier than uranium D) elements that are heavier than hydrogen E) elements that are heavier than carbon
Einstein's famous equation E = mc2 is a statement of the equivalence of energy and the square of the speed of light
a. True b. False Indicate whether the statement is true or false
A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68°F and 50°F. Determine the rate of heat transfer (in BTU/ft2/h) if the R values are 1.93 and 8.7 ft2/°F/h/BTU, respectively
a. 9.7 b. 2.5 c. 5.3 d. 1.7 e. 28
The continuous part of an x ray spectrum of an atom occurs because
a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons