Four of following are factors that must be overcome by a large molecular cloud before gravitational contraction can begin. Which one is the exception??
A. thermal energy of gas
B. magnetic fields
C. rotation of gas clouds
D. intense radiation from a nearby star
Answer: D. intense radiation from a nearby star
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Briefly explain why spectral lines are useful in determining the temperature of their source
What will be an ideal response?
For a body oscillating at the end of a spring, the energy is
a. kinetic energy. b. elastic potential energy. c. gravitational potential energy. d. all of the above. e. none of the above.
A 29.0 pm wavelength photon is scattered by a stationary electron. The maximum energy loss of the photon is closest to:
A) 4 KeV B) 6 KeV C) 10 KeV D) 12 KeV E) 15 KeV