According to Alan Guth, magnetic monopoles are not observed in our universe because
A) they are theoretically impossible.
B) space expanded so much that they are exceedingly rare.
C) of the presence of electromagnetic radiation.
D) they easily collapse under the force of gravity.
Answer: B
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An object that is a perfect absorber and emitter of radiation is called a(n) _______________
Fill in the blank(s) with correct word
Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere. B) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight. C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight. D) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight. E) It isn't: both hemispheres have the same seasons at the same time.
An electron beam directed through a magnetic field
A) may be deflected. B) may experience a force. C) both of these D) neither of these
The distance between the ruled lines on a grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3° B) 4.3° C) 5.3° D) 6.3° E) 2.3°