Radiant energy from the Sun reaches the Earth at a rate of
When 30.0% of the radiant energy is reflected and 70.0% absorbed, the average temperature of the Earth's atmosphere is 253 K or -20.0
If the atmosphere reflected 20.0% and absorbed 80.0% of the solar radiant energy, then what is the average temperature of the Earth's atmosphere?
A. -10.1
B. -11.4
C. -12.3
D. -14.5
E. -17.4
B. -11.4
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Self-Inductance: What is the self-inductance of an ideal solenoid that is 300 cm long with a cross-sectional area of 1.00 × 10-4 m2 and has 1000 turns of wire? (?0 = 4? × 10-7 T ? m/A)
A. 4.19 nH B. 4.19 pH C. 4.19 ?H D. 41.9 nH E. 41.9 µH
A ray in glass is incident onto a water-glass interface, at an angle of incidence equal to half the critical angle for that interface. The indices of refraction for water and the glass are 1.33 and 1.43, respectively
The angle that the refracted ray in the water makes with the normal is closest to: A) 37° B) 42° C) 47° D) 32° E) 27°
You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond
How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 8.9 × 1019 B) 8.9 × 1018 C) 5.9 × 1019 D) 2.7 × 1018
By what factor is the intensity of sound at a rock concert louder than that of a whisper when the two intensity levels are 120 dB and 20 dB respectively?
a. 1012 b. 108 c. 106 d. 1010 e. 1011