A source of light is at a temperature of 1000°C. Its temperature is then increased to 2000°C, Increasing the temperature causes the peak intensity wavelength to
A)
triple.
B)
halve.
C)
decrease but not quite halve.
D)
double.
E)
more than double.
C
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Spherical Mirrors: If you stand in front of a convex mirror, at the same distance from it as its focal length,
A. you won't see your image because there is none. B. you won't see your image because it is focused at infinity. C. you will see your image and you will appear smaller than you. D. you will see your image and you will appear larger than you. E. you will see your image and it will be the same size as you except upside down.
The Earth intercepts 1.27 × 10^17 W of radiant energy from the Sun. Suppose the Earth, of volume 1.08 × 10^21 m3, was composed of water. How long would it take for the Earth at 0°C to reach 100°C, if none of the energy was radiated or reflected back out into space?
a. 26.9 y b. 113 y c. 2.69 × 10^4 y d. 1.13 × 10^5 y e. 2.69 × 10^7 y
What is magnetic declination?
The difference between a LED and a laser is that a LED has spontaneous photon emission, and a laser has _________photon emission.
Fill in the blank(s) with the appropriate word(s).