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.
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.
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A small galvanometer coil of resistance R = 20 ? and full-scale deflection at 1 mA is connected in series with a 4980 ? resistance to build an analog voltmeter. What is the maximum voltage that this voltmeter can read?
A) 3 V B) 1 V C) 50 V D) 5 V E) 10 V
The theory proposing light as a particle is supported by
1.the sparks created in Hertz' experiment with the spark gap oscillator. 2.the speed of light turning up in Maxwell's equations. 3.the interference caused by light in Young's double slit experiment. 4.the photoelectric effect Hertz discovered.
If you were to measure your pulse rate while in a spaceship moving away from the sun at a speed close to the speed of light, you would find that it was
A) much faster than normal. B) much slower than normal. C) the same as it was here on Earth.
A common property used to measure temperature is the ______________ of materials
Fill in the blank(s) with correct word