An image is formed by a converging lens. Suppose the bottom half of the lens in covered, as shown
What happens to the image?
1.The image disappears.
2.The image fades.
3.The image rotates.
4.The image moves relative to the lens.
5.The top half of the image disappears.
6.The bottom half of the image disappears.
7.Nothing.
8.None of the above.
2
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According to current understanding of plate tectonics, which of the following is true about Earth's seafloors?
A) They are built from rocks that are older than the rocks found on the continents. B) They represent the thickest regions of Earth's crust. C) Their material is almost completely recycled over a time period of about 200 million years. D) They should be covered with numerous impact craters dating to the time of the heavy bombardment.
Which is the net result of the proton-proton chain?
A) 2 protons ? deuterium + a positron + an antineutrino + X-rays B) 6 protons ? 2 helium 4 + 3 positrons + 3 neutrinos + gamma rays C) 4 protons ? 1 helium 4 + 2 neutrinos + gamma rays D) 4 protons ? 1 helium 4 + a positron + a neutrino + gamma rays E) 4 protons ? 2 helium 2 + 2 positrons + ultraviolet radiation
According to the solar nebula theory, dust grains, whatever their composition, grew from microscopic size first by condensation, then by accretion
Indicate whether the statement is true or false
A star has a parallax angle of 0.019 seconds of arc. How far away is this star from Earth?
What will be an ideal response?