Why do you hear thunder a substantial time after seeing a lightning flash?
a. The sound is produced later than the light is.
b. Your eyes respond more quickly than your ears.
c. The flash and thunder really are simultaneous, but the thunder lasts longer than the flash.
d. Sound travels much more slowly than light.
d
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Roughly how many different chemical compounds are there?
A) 20 B) 100 C) 4 D) 500 E) many more than 500
______________ is the downslope movement of surface materials as a result of gravity and of the agents that cause such movement
Fill in the blank(s) with correct word
Two sources emit beams of light of wavelength 550 nm. The light from source A has an intensity of 10 µW/m2,
and the light from source B has an intensity of 20 µW/m2. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.) A) Beam B carries twice as many photons per second as beam A. B) A photon in beam B has twice the energy of a photon in beam A. C) The frequency of the light in beam B is twice as great as the frequency of the light in beam A. D) A photon in beam B has the same energy as a photon in beam A. E) None of the above statements are true.
Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A. Star A is hotter and smaller than Star B. B. Star A is cooler and bigger than Star B. C. Star A is hotter and bigger than Star B. D. Star A is cooler and smaller than Star B.