For each 4He produced in a proton-proton chain, _____
A) the first reaction must occur four times.
B) the first and second reactions must occur twice.
C) the second and third reactions must occur four times.
D) the third reaction must occur twice.
B
You might also like to view...
When light goes from a material with a lower index of refraction n1 into a material with a higher index of refraction n2 with an angle of incidence of 
which of the following is true?
A. the angle of refraction is more than
B. the angle of refraction is less than
C. total internal reflection may occur
D. the angle of refraction is more than
and total internal reflection may occur
E. the angle of refraction is less than
and total internal reflection may occur
An atom in a state with its orbital quantum number l = 1 decays to its ground state (with l = 0). A photon of wavelength 630.000 nm is emitted in the process
When the same process takes place in the presence of an intense magnetic field, the following change in the spectrum is observed. With the magnetic field present, one of the emitted lines observed now has a wavelength of 630.030 nm. Which of the following wavelengths would you expect to be also present? A) 630.060 nm B) 629.970 nm C) 630.090 nm D) 629.910 nm E) 630.120 nm
Potential: As an electron moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
Explain as exactly as possible the way in which the central engine of active galaxies and quasars actually works. Why is the orientation so important?
What will be an ideal response?