Of the various wavelengths emitted from a hydrogen gas discharge tube, those that are associated with transitions from higher levels down to the n = 1 level produce which of the following?
a. infrared
b. visible
c. mixture of infrared and visible
d. ultraviolet
d
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In a nuclear reactor, _________________ are used to limit the number of neutrons passing from one fuel rod to another
Fill in the blank(s) with correct word
Metamorphism caused by the close proximity of a magma source is called
A) contact metamorphism. B) dynamic metamorphism. C) regional metamorphism. D) none of these
Which of the following statements about the celestial sphere is not true?
A) When we look in the sky, the stars all appear to be located on the celestial sphere. B) Earth is placed at the center of the celestial sphere. C) The celestial sphere does not exist physically. D) The "celestial sphere" is just another name for our universe. E) From any location on Earth, we can see only half the celestial sphere at any one time.
The energy used by a 100 watt light bulb in 1 hour is __________
Fill in the blank(s) with correct word