A very bright UFO is seen near the moon's orbit. An astronomer takes a spectrum of it and discovers it has a bright line spectrum on a dark background. The earth's population is near panic when the astronomer announces the UFO is
A) a metal spacecraft.
B) a giant rock about to hit Earth.
C) a glowing cloud of gas.
D) a star like the sun.
Correct Answer:
Verified
Q11: The neutral hydrogen atom consists of
A)one proton
Q40: The binding energy of the first level
Q41: The nucleus is made of _
A) electrons
Q43: An atom can be ionized by _
Q45: If a light-emitting object is moving away
Q48: Which one of the hydrogen atoms below
Q49: The number of _ in the nucleus
Q57: The wavelength of the hydrogen line from
Q58: The process of making an electron less
Q69: The process of removing an electron from
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