The two major types of nebulae are
a. emission nebulae and dark nebulae.
b. bright nebulae and dark nebulae.
c. bright nebulae and reflection nebulae.
d. reflection nebulae and emission nebulae.
b
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Once crossed, not even light can return over the ________ of a black hole
Fill in the blank(s) with correct word
A diffraction grating has 300 lines per mm. If light of frequency 4.76 × 1014 Hz is sent through this grating, at what angle does the first order maximum occur? (c = 3.00 × 108 m/s)
A) 56° B) 44° C) 22° D) 11° E) 28°
What is the exosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs X-rays E) the highest layer in the atmosphere
A particle of interplanetary dust is close to the Sun and interacts with the Sun's gravitational field as well as with the light emitted by the Sun
If it only interacts appreciably with the Sun, can it be pushed away from the Sun instead of being pulled towards it? A) No, the gravitational force will always dominate if the object is large enough. B) No, the gravitational force will always dominate if the object is close enough. C) Yes, if the object is small enough, radiation pressure will win over. D) Yes, but the object must be very large so that it can gain enough radiation pressure. E) None of the previous answers is correct.