The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. high voltage
b. high flux of electrons
c. nearby presence of photons of same wavelength as those emitted
d. high temperature
c
Physics & Space Science
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A 1.6-kg block slides down a plane (inclined at 25° with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
A. +28 W B. +13 W C. ?13 W D. ?28 W E. +6.5 W
Physics & Space Science
The slow, 25,800-year rotation of Earth's axis is called ______________
Fill in the blank(s) with correct word
Physics & Space Science
A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?
A) 100 nm B) 118 nm C) 151 nm D) 173 nm E) 189 nm
Physics & Space Science
Solar flares have no known effect on Earth
a. True b. False Indicate whether the statement is true or false
Physics & Space Science