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
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.
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
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