A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction
If the wavelength of the incident photon is 0.6110 nm, what is the kinetic energy of the recoiling electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 1.5 × 10-18 J
B) 1.9 × 10-18 J
C) 3.1 × 10-18 J
D) 4.3 × 10-18 J
E) 5.2 × 10-18 J
B
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The Sun has a continuous visual spectrum with dark absorption lines. The continuous spectrum is produced by the ____________ layer while the dark absorption lines are produced by ____________layers
a. inner chromosphere; outer photosphere b. inner photosphere; outer chromosphere c. inner chromosphere; outer corona d. inner corona, outer chromosphere
What would be different if this figure were drawn accurately to scale?
A) The dots that represent individual asteroids would have to be much smaller. B) The dots that represent individual asteroids would overlap each other. C) The dots should be farther from the Sun.
Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger. B) observing distant systems that produce unusually strong gamma-ray emission. C) observing distant systems that produce unusually strong radio emission. D) detecting rapidly pulsating sources of gamma-ray emission.
Which star evolves off the MS first if all formed at once?
A: O-type star B: 9000K surface temperature star C: a star twice as massive as the Sun D: a star with a radius 0.3 times the Sun E: an M-type star