How can the density of the Sun be measured?
A) by using the density of hydrogen as measured on Earth
B) by analysing samples of the solar wind
C) by using the amount of area covered by Venus during a transit
D) by using Newton's laws and the Sun's diameter
Correct Answer:
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Q19: What causes an atom to become excited?
A)emitting
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Q23: What does a non-ionized atom always contain?
A)the
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