Why was Herschel's strategy for mapping our Galaxy flawed?
A) His infrared telescopes couldn't penetrate the dust clouds.
B) He used globular clusters, lying above the dust in the disc.
C) He relied on visual wavelengths, which are obscured by dust.
D) He used radio telescopes that didn't give enough resolution.
E) He assumed Earth was at the extreme edge of the Galaxy.
C
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Self-Inductance: The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?
A. 1100 V B. 11 mV C. 32 mV D. 32 V
Fissioning an iron nucleus would occur with
A) absorption of energy. B) release of energy. C) neither absorption nor release of energy
How far are you from your image when you stand 0.75 m in front of a vertical plane mirror?
A) 0.38 m B) 0.75 m C) 1.5 m D) 3.0 m E) none of the given answers
The energy source responsible for molecular motions in Earth's atmosphere is
A) their own natural kinetic energy. B) pressure caused by the weight of air. C) atmospheric tides. D) the Sun.