According to Wein's law, the wavelength of the peak energy will be ________ if the temperature of the blackbody is doubled
A) unchanged B) quadrupled C) doubled D) halved E) quartered
D
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At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines
a. straight up from the horizon. b. straight up from the horizon slanting toward the right. c. straight up from the horizon slanting toward the left. d. parallel to the horizon.
The most abundant gas in the Earth's atmosphere is
A) helium. B) nitrogen. C) hydrogen. D) oxygen. E) water vapor.
Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from ?15°C to +35°C. (?STEEL = 1.1 × 10^?5/°C)
What determines the smallest angular separation that two objects can have and, ideally, show up in a photograph as two separate objects?
a. How far away the objects are. b. The shutter speed of the camera. c. The size of the opening that lets the light into the camera lens and the wavelength of the light. d. Just the wavelength of the light. e. Just the size of the opening that lets in the light into the camera.