TV remote controls use ________ radiation
Fill in the blank(s) with correct word
infrared
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A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?
Which of the following would not be considered a physical property?
A) temperature at which a material catches on fire B) color C) conductivity D) hardness E) temperature at which a material melts
When unpolarized light passes through a polarizing filter,
A. all the light passes through and remains unpolarized. B. about half the light passes through and remains unpolarized. C. it is completely absorbed by the filter. D. all the light passes though and is now polarized. E. about half the light passes through and is now polarized.
__________ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant b. A galaxy's color c. A galaxy's rotation curve d. A galaxy's diameter e. The velocity dispersion method