Siddhartha saved up money from his summer job to buy a powerful home theater system. When shopping for the best buy in a home theater system the sales representative informs Siddhartha that the more expensive models are worth the money because they ____.
A) amplify sound up to 160 dB
B) boost frequencies below 80 Hz
C) buffer sounds that reach 60 dB
D) filter out frequencies below 10000 Hz
Answer: B) boost frequencies below 80 Hz
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An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field. At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C)
A) 2.1 × 1010 Hz B) 4.8 × 10-7 Hz C) 2.1 × 1014 Hz D) 4.8 × 10-11 Hz
The ultimate source of energy from fossil fuels is the
A) Sun. B) radioactivity in Earth's interior. C) photosynthesis process. D) natural processes in Earth's interior.
The Milky Way Galaxy is a part of a galaxy cluster known as _____
A) the Virgo Cluster B) the Local Group C) the M 81 Group D) the Bullet Cluster
We know Mercury must have a large metal core because it has a high density
Indicate whether the statement is true or false