Which of the following general statements about light and Earth's atmosphere is not true?
A) X-rays from the Sun are absorbed in the thermosphere.
B) Visible light from the Sun is absorbed in the exosphere.
C) Ultraviolet from the Sun is absorbed in the stratosphere.
D) Infrared light emitted by Earth itself is absorbed in the troposphere.
B
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Charge of uniform density (3.5 nC/m) is distributed along the circular arc shown. Determine the electric potential (relative to zero at infinity) at point P.
A. 61 V B. 42 V C. 52 V D. 33 V E. 22 V
Which one of the following quantities is equivalent to 1 W?
A) 1 ? ? m B) 1 V ? A C) 1 V/A D) 1 V/? E) 1 A ? s
Proxima Centauri has an absolute visual magnitude of 15.5 and an apparent visual magnitude of 11.0 . What is the distance to Proxima Centauri in units of pc?
a. 0.1 b. 10^0.1 c. 10^–0.1 d. None of the other choices are correct.
A 360-nm thick oil film floats on the surface of a pool of water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what is the wavelength of light between 400 nm to 800 nm wavelength that is most weakly reflected? A) 520 nm B) 540 nm C) 560 nm D) 580 nm E) 600 nm