Primary cosmic rays consist of
A) atomic nuclei, mainly protons.
B) neutral atoms, mainly of hydrogen.
C) molecules.
D) electrons.
Correct Answer:
Verified
Q34: Galactic spectra show
A) red and blue shifts.
B)
Q35: In the light of current evidence, a
Q36: The galaxies in the universe are distributed
A)
Q37: Primary cosmic rays are produced
A) in the
Q38: In the universe today there
A) seems to
Q40: Dark energy
A) is the energy equivalent of
Q41: The number of planets outside the solar
Q42: The heavy elements in the earth were
Q43: Communications with planets outside the solar system
Q44: Nearly all the helium in the universe
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