The Sun's composition (by mass) is approximately
A) 100 percent hydrogen and helium.
B) 50 percent hydrogen, 25 percent helium, 25 percent other elements.
C) 70 percent helium, 28 percent hydrogen, 2 percent other elements.
D) 70 percent hydrogen, 28 percent helium, 2 percent other elements.
E) 98 percent hydrogen, 2 percent helium, and other elements.
D) 70 percent hydrogen, 28 percent helium, 2 percent other elements.
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What is the safest way or method to observe a solar eclipse?
a. using a telescope b. wearing sunglasses c. by observing with your naked eyes d. through a pinhole projection e. through a UV filter held up to the sky
Two-Source Interference of Sound: Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 1.00 m parallel to the wall, she experiences destructive interference for the first time. What is the frequency of the sound? The speed of sound in air is 343 m/s.
A. 211 Hz B. 256 Hz C. 422 Hz D. 512 Hz E. 674 Hz
Which one of the following IS NOT a characteristic of terrestrial planets?
a. low average density b. orbits inside the asteroids c. craters in old surfaces d. small diameters e. very few satellites
What is meant by an isotherm?
What will be an ideal response?