If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. both the inner and outer surfaces will become negative.
b. both the inner and outer surfaces will remain neutral.
c. the outside surface of the conductor will become positively charged.
d. the inside surface of the conductor will become positively charged.
d
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According to the Schrödinger equation, the probability of finding a hydrogen atom's ground-state electron 0.053 nm from the proton is
a. zero. b. high, but not 100%. c. low, but not zero. d. 100%.
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz
You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s. A) 1300 Hz B) 1320 Hz C) 1270 Hz D) 1360 Hz E) 1370 Hz
By what factor should the length of a simple pendulum be changed if the period of vibration were to be quadrupled?
a. 16 c. 0.25 b. 4.0 d. 1/16
Why is it surprising that spiral arms are stable structures, lasting billions of years? a. Differential rotation should tear the arms apart
b. Gas and dust clouds should run out of material to make young stars. c. Supernova explosions should disrupt the arms. d. Globular clusters are continuously passing through the arms. e. Gravity should pull the arms down into the center of the galaxy.