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Chapter 38: Q. 12.64 (page 1116)
Very large, hot stars鈥攎uch hotter than our sun鈥攃an be identified by the way in which ions in their atmosphere absorb light. What are the three longest wavelengths, in nm, in the Balmer series of ?
There are three wave lengths that are the longest are
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The electrons in a cathode-ray tube are accelerated through a potential difference and then shot through a 33-nm-diameter circular aperture. What is the diameter of the bright spot on an electron detector behind the aperture?
A red laser with a wavelength of 650 nm and a blue laser with a wavelength of 450 nm emit laser beams with the same light power. How do their rates of photon emission compare? Answer this by computing Rred/Rblue.
An electron confined in a one-dimensional box is observed, at different times, to have energies of 12 eV, 27 eV, and 48 eV. What is the length of the box?
A proton emits a gamma-ray photon with energy 2.0 MeV in a quantum jump from n =2 to n= 1.
A photoelectric-effect experiment finds a stopping potential of when light of is used to illuminate the cathode.
a. From what metal is the cathode made?
b. What is the stopping potential if the intensity of the light is doubled?
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