What is the difference between the proton-proton chain and the CNO cycle?
What will be an ideal response?
The proton-proton chain occurs at temperatures over 4 million Kelvin, and combines hydrogen to make helium.
The CNO cycle, which occurs at temperatures greater than 16 million Kelvin, results in the same product as the proton-proton chain. It is different than the proton-proton chain because carbon-12 begins the cycle and ends the cycle, and includes steps in which protons combine with carbon and nitrogen nuclei.
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Standing Waves on a String: A 4.0-g string is 0.39 m long and is under tension. The string vibrates at 600 Hz in its third harmonic. What is the tension in this string?
A. 250 N B. 200 N C. 160 N D. 290 N E. 340 N
A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of If the clay comes to a stop in what is the average horizontal force on the clay due to the wall?
A) 42 N B) 26 N C) 35 N D) 51 N
In the final phases of its "life", our sun will
A) collapse to become a white dwarf. B) turn into a cockroach. C) blow up in a supernova explosion. D) pass through the white dwarf state, then the neutron star state, and finally the black hole state. E) collapse and continue to collapse, forever.
The majority of the radiation emitted to the general public in the normal operation of a nuclear plant comes from the ________
a. cooling water discharged to a lake or a river. b. reactor core directly. c. spent fuel rods stored on site. d. fission fragment gases vented to the atmosphere. e. low level wastes shipped from the plant