An electron orbiting a hydrogen atom in the second energy level drops down a level, and a photon is emitted. What is the frequency of the photon? (Planck's constant, h, should be in units of eV.)
3
Physics & Space Science
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A 13.7-?F capacitor is connected to an AC source with an rms voltage of 148 V and a frequency of 40.0 Hz. What is the rms current in the capacitor?
a. 0.162 A b. 0.255 A c. 0.509 A d. 0.360 A e. 0.720 A
Physics & Space Science
In terms of energy levels of electrons, a potential well has
a. a negative value. b. a positive or a negative value. c. a positive value. d. none of these.
Physics & Space Science
An inductor and a resistor are connected in series across an AC generator as in Figure OQ33.1. Immediately after the switch is closed, which of the following statements is true?
The most massive region of the Milky Way Galaxy is _____
A. the galaxy's bulge B. the dark matter halo C. the galaxy's disk. D. the supermassive black hole.
Physics & Space Science