A sound intensity of 70 dB is observed at a distance d from the source of sound. What sound intensity would be observed at a distance 2d from the source?
a. 68 dB b. 67 dB
c. 64 dB d. 62 dB
c
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A) a star that is still in the process of forming B) a star that has planets C) an intermediate-mass star D) a star in its final stage of life
Of all visible objects in the celestial sphere, which appears to move the least? Why?
What will be an ideal response?
The strongest piece of evidence that supports the Big Bang is the
A) fact that the universe is expanding B) detection of dark matter in galaxies C) fact that stars have finite lifetimes D) detection of the cosmic microwave background radiation left over from the formation of the universe
What is the self-inductance in a coil that experiences a 3.0-V induced emf when the current is changing at a rate of 37 A/s?
a. 81 mH c. 27 mH b. 37 mH d. 45 mH