Light of a wavelength of 661.1 nm is received from a star that is emitting light of a wavelength of 659.6 nm. How fast is the star moving relative to the earth and is it moving toward or away?
A. -580 km/s away
B. 580 km/s away
C. -680 km/s away
D. 680 km/s away
C. -680 km/s away
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Which of the following energy transport processes involves mass motions of material?
a. radiation b. conduction c. convection d. All of the other choices are correct.
A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg?m2/s) is
A. 50. B. 20. C. 40. D. 25. E. 70.
Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?
What will be an ideal response?
The motion of the Sun with respect to the stars is retrograde, i.e., east to west relative to the stars.
Answer the following statement true (T) or false (F)