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Q. A recording engineer works in a soundproofed room that is 45.0 dB quieter than the outside. If the sound intensity in the room is 1.30 10-10 W/m2, what is the intensity outside?

Q. A certain star is 79.9 light years away. How long would it take a spacecraft traveling 0.960c to reach that star from earth, as measured by observers:

(a) on Earth
(b) on the spacecraft
(c) What is the distance traveled according to observers on the spacecraft
(d) What will the spacecraft occupants compute their speed to be from the results of (b) and (c)?

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