In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 2 level, the circumference for its orbit becomes 4 times greater. This occurs because

a. there are four times as many wavelengths in the new orbit.
b. the wavelength of the electron becomes four times as long.
c. there are twice as many wavelengths, and each wavelength is twice as long.
d. the electron is moving four times as fast.


c

Physics & Space Science

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Because of their mass, the threshold temperature for electrons is:

A) higher than that of neutrons. B) lower than that of protons. C) higher than that of protons. D) lower than that of hydrogen. E) higher than that of hydrogen.

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Find the binding energy (in MeV) of carbon-12. Assume: mC = 12.000 000 u m p = 1.007 825 u m n = 1.008 665 u u = 1.66 × 10^-27 kg

a. 14.8 b. 0.511 c. 9.11 d. 92.3 e. 46.2

Physics & Space Science

In weight-critical designs, the stiffness requirement for the relative merit uses the relative ___________elastic modulus.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

The boundary between p-type material and n-type material in a diode is called the

a. anode. b. the cathode. c. the pn junction. d. the control grid.

Physics & Space Science