The quantum numbers of electrons on an atom include the principal quantum number, the angular-momentum quantum number, the magnetic quantum number, and the ______________quantum number of +/–1/2.
Fill in the blank(s) with the appropriate word(s).
spin
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While you are sounding a tone on a toy whistle, you notice a friend running toward you. If you want her to hear the same frequency that you hear even though she is approaching, you must
a. stay put. b. run towards her at the same speed. c. run away from her at the same speed. d. stay put and play a note of higher frequency. e. run towards her and play a note of higher frequency.
Why does the Main Sequence part of a star's life end?
A: Much of the mass of the star has evaporated B: The Hydrogen in the core is exhausted C: The Helium in the core is exhausted D: The temperature drops so that nuclear reactions are no longer possible E: The gravitational force is no longer large enough to balance the pressure
Electric Field of Point-Charges: Three equal positive point charges +q are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A B. B C. C D. D
In a Young's double-slit experiment, what happens to the angular separation between the fringes when the wavelength is increased at the same time that the slit separation is decreased?
a. It increases. b. It decreases. c. It stays the same. d. The relative sizes of the changes need to be known before a definite answer can be given.