A compact object with a mass of 4 solar masses must be a black hole
a. True
b. False
Indicate whether the statement is true or false
True
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Most of the visible light from the sun originates in the photosphere
Indicate whether the statement is true or false
______________ is defined as the angular measurement, in degrees, east or west of the Greenwich, or prime, meridian
a. The equator b. The International Date Line c. Latitude d. Longitude
Which particle in the free state is least stable?
a. electron c. photon b. neutron d. proton
A guitar is perfectly tuned. The tension on its strings is then increased. Which of the following is true?
A. The speed of sounds from the guitar is larger than before B. The frequencies of sounds from the guitar are higher than before C. The wavelengths of sounds from the guitar are longer than before D. The amplitudes of sounds from the guitar are larger