When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V
What is the threshold (cutoff) frequency of this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 3.47 × 1014 Hz
B) 3.74 × 1014 Hz
C) 4.73 × 1014 Hz
D) 7.36 × 1014 Hz
D
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An electron is bound in an infinite well (a box) of width 0.10 nm. If the electron is initially in the n = 8 state and falls to the n = 7 state, find the wavelength of the emitted photon
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) What will be an ideal response?
If L represents angular momentum, I represents rotational inertia, p represents linear momentum, m represents mass, and r represents a distance, which of the following can represent kinetic energy?
A. p2/2m B. L2/2I C. rpI D. all of the above E. both (a) and (b)
How long does it take an M-type star to reach the main sequence, compared to a solar-type star?
A) longer than the age of the Galaxy B) about twice as long C) a tenth as long D) about twenty times longer E) about the same, 30 million years
In the brain, a typical frequency for an alpha wave is ______ Hz and for a delta wave is ______ Hz
a. 2, 4 c. 12, 4 b. 3, 12 d. 10, 14