A nonrelativistic electron has a kinetic energy of 5.4 eV. What is the energy of a photon whose wavelength is the same as the de Broglie wavelength of the electron? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 2.4 keV
B) 2.2 keV
C) 2.0 keV
D) 2.5 keV
E) 2.7 keV
A
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What are the "friends" (i.e. other types of galaxies) referred to in the Riddle?
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In general, which of the following is usually the strongest bond?
A) van der Waals bond B) ionic bond C) hydrogen bond
In a Young's double-slit interference apparatus, the distance from the slits to the screen is tripled. The distance between adjacent light and dark fringes changes by a factor of:
a. 1/3. c. 3. b. 1. d. 1/9.
Which tin can will roll down an incline in the shortest time, one filled with water or one filled with ice? (Hint: water 'slides' inside the can.)
A) with water B) with ice C) both the same D) need more information