The intensity level of an orchestra is 85 dB. A single violin achieves a level of 70 dB. How does the intensity of the sound of the full orchestra compare with that of the violin?
IOrchestra = 31.6IViolin
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A.) Cepheid variables in galaxies. B.) White dwarf supernovae in galaxies. C.) Redshifts of bright objects in galaxies. D.) A and B. E.) All of the above.
A star radiates most strongly at 600 nanometers. What is its surface temperature?
A. 7,250 K B. 483 K C. 6,000 K D. 72,500 K E. 4,830 K
Which of these stars lies closest to the north celestial pole on the celestial sphere?
A) Deneb B) Alpha Centauri C) Spica D) Sirius
If in a double-slit experiment the slit separation is increased, which of the following happens to the interference pattern shown on the screen?
A) The minima get closer together. B) The maxima stay at the same position. C) The minima and maxima stay at the same position. D) The minima stay at the same position. E) The maxima get further apart.