The element most abundant in the Sun is oxygen
a. True
b. False
Indicate whether the statement is true or false
False
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One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.
You shine a beam of monochromatic light from Earth to an astronaut friend in orbit. The light your friend receives, relative to light from an equivalent source on the spaceship, is slightly
A) slower in speed. B) higher in speed. C) neither of these
In a hydrogen atom, a given electron has ? = 7. How many possible values can m1 have?
A) 6 B) 7 C) 15 D) 98
Magnetic Field of a Long Wire: A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the direction of the magnetic field at a point P due to this wire?
A. into the plane of the page B. out of the plane of the page C. along the -x-axis D. along the +x-axis E. along the +y-axis