The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom.
b. of the presence of helium atoms.
c. the protons must overcome the Coulomb barrier.
d. of the need for low density.
e. the neutrinos carry more energy away than the reaction produces.
C
You might also like to view...
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
A. 980 N B. 200 N C. 98 N D. 49 N E. Some value other than those given above.
Why would it be impossible to obtain interference fringes in a double-slit experiment if the separation of the slits is less than the wavelength of the light used?
What will be an ideal response?
The orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy
a. I b. IV c. I & IV d. II & IV e. I & III
The following images show five planets in our solar system. Rank these planets from left to right based on the amount of time it takes them to orbit the Sun, from longest to shortest. (Not to scale.)
What will be an ideal response?