What do we see when white light passes through a cool cloud of gas?
A) visible light
B) infrared light
C) thermal radiation
D) an absorption line spectrum
E) an emission line spectrum
D) an absorption line spectrum
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Radiation: 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. 60.3 W B. 62.6 W C. 65.7 W D. 68.4 W E. 64.8 W
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.
Which of the following is a major reason why it so difficult to obtain direct images of extrasolar planets?
A) The light of the planets is overwhelmed by the light from their star. B) Extrasolar planets give off light at different wavelengths than planets in our solar system. C) No telescope is powerful enough to detect the faint light from a distant planet. D) Telescopes are too busy with other projects.
Distinguish between longitudinal and transverse waves