What is the intensity level of a sound with intensity of 5.0 × 10^-11 W/m2? (I0 = 10-12 W/m2)
a. 74 dB
c. 17 dB
b. 54 dB
d. 27 dB
C
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Which of the following is an essential agent of the Bergeron process?
a. Wind b. Carbon dioxide c. Mixing d. Rain
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a cooler temperature. C) The Sun's core would reach a new equilibrium, but at a higher temperature. D) The Sun's core would cool and the rate of fusion would decrease.
A binary star system in the constellation Orion has an angular separation between the stars of 4×10?5 radians. Assuming a wavelength of 500 nm, what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10?9 m)
a. 1.2 cm b. 1.5 mm c. 1.5 cm d. 4.8 cm e. 20 mm
One of the "nails in the coffin" for the Earth-centered universe was
A) the retrograde motion of the planets. B) Galileo's observation of stars in the Milky Way. C) eclipses of the Sun. D) Galileo's observations of the moons of Jupiter. E) the phases of the Moon.