The orientation of an image seen projected on a screen by a single lens is always __________
Fill in the blank(s) with correct word
inverted
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Why should photons emitted by a hotter gas have, on average, shorter wavelengths than photons emitted by a cooler gas?
What will be an ideal response?
Gravity follows an inverse square law. This means that if the distance between two masses is decreased by a factor of 4, the gravitational force between those two masses
A) increases by a factor of 16. B) increases by a factor of 4. C) increases by a factor of 2. D) decreases by a factor of 4. E) decreases by a factor of 16.
A mountain top is an especially good site for infrared telescopes since:
A) there you are closer to celestial objects. B) you are above most of the carbon dioxide and water vapor in the atmosphere. C) the cold weather helps the sensitivity of infrared detectors. D) less air above means better seeing in many cases. E) All of the above are factors.
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
A. Neither, because the specific heat depends on the substance and may vary with temperature. B. Neither, because a change of state may involve release or absorption of latent heat. C. Neither because a substance may do work during a temperature change. D. All of the statements above are correct. E. Only statements (a) and (b) are correct.