The ratio M/m of the prefixes M and m has what value?
a. 103
c. 109
b. 106
d. 1018
C
You might also like to view...
Which of the following is true of early astronomers?
A) They knew that there were many other galaxies in the Universe. B) They thought the entire Universe consisted of Earth, the Sun, the Moon, and five other planets. C) They knew that the planets were made of rock and gas, much like Earth. D) They thought that stars were other objects like the Sun and that we lived inside a galaxy.
The variations in the angle at which the Sun's rays strike Earth's surface give us the seasons. Name four physical factors that contribute to the Earth's seasons. (Hint: Think of the big picture.)
What will be an ideal response?
The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels
Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next? A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) A different electron drops into level 1, since it is now unoccupied. D) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
A lens that is curved inwards at the center on both sides so that the lens has greater thickness at its edges is called
a) a convex lens. b) a refracting lens. c) a converging lens. d) a concave lens.