__________ results because the speed of light in a transparent medium varies with frequency
Fill in the blank(s) with correct word
Dispersion
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How can some mergers activate spirals, and others destroy them?
What will be an ideal response?
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
A) WIMPs are light enough that they have expanded out into the halo. B) Shock waves from generations of supernovae have blown the WIMPs out into the halo. C) WIMPs annihilate when they come into contact with ordinary matter, such as stars. D) WIMPS cannot produce photons, therefore they rarely interact and exchange energy with other particles. E) WIMPs were produced in the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed first.
If the frequency of a light beam is doubled, what happens to the momentum of the photons in that beam of light?
A) It stays the same. B) It is halved. C) It is doubled. D) It is reduced to one-fourth of its original value. E) It is increased to four times its original value.
I use a rope 1.00-m-long to swing a 1.00-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?
a. 20.0 J b. 31.4 J c. 123 J d. 0