Relate black holes in the early galaxies to quasars
What will be an ideal response?
Star-produced black holes in young galaxies could migrate to their centers. As the black holes merged and formed supermassive black holes, the accretion of matter around them created the quasar outpouring of energy.
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What is the approximate average temperature of the Sun's surface?
a. 5000oC b. 5800 K c. 10,000oC d. 6400 K e. 5800oC
Waves on a String: A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 kg and is under a tension of 2000 N.(a) What is the speed of the wave on the wire?(b) Find the frequency of this wave.
What will be an ideal response?
What is the frequency of monochromatic light where the photon energy is 4.3 × 10^?19 J? (h = 6.63 × 10^?34 J?s)
a. 4.3E+15 Hz b. 2.1E+15 Hz c. 6.5E+14 Hz d. 1.9E+14 Hz e. 6.5E+13 Hz
What is the wavelength in meters, of a sound wave (v = 340 m/s) with a frequency of 4 Hz?
a. 85 Hz b. 1360 Hz c. 340 Hz d. 0.012 Hz