If two stars have the same parallax, but the brighter is magnitude +2.3, and the fainter is magnitude +3.3, then the fainter star is ________ less luminous
Fill in the blank(s) with correct word
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Distinguish an E0 from an E7 galaxy
What will be an ideal response?
The photoelectric effect occurs when electrons are emitted when light strikes the surface of a metal
Indicate whether the statement is true or false
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Fusion can only proceed by the proton-proton chain and therefore requires that protons come close enough together to be linked up into a chain. B) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together.
Which of the following statements is true of green grass?
A) It absorbs red light and emits green light. B) It absorbs red light and reflects green light. C) It transmits all colors of light except green. D) It means the lawn is healthy.