Which is the net result of the proton-proton chain?
A) 2 protons ? deuterium + a positron + an antineutrino + X-rays
B) 6 protons ? 2 helium 4 + 3 positrons + 3 neutrinos + gamma rays
C) 4 protons ? 1 helium 4 + 2 neutrinos + gamma rays
D) 4 protons ? 1 helium 4 + a positron + a neutrino + gamma rays
E) 4 protons ? 2 helium 2 + 2 positrons + ultraviolet radiation
C
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A 7.0-kg rock is subject to a variable force given by the equation F(x) = 6.0 N - (2.0 N/m)x + (6.0 N/m2)x2 If the rock initially is at rest at the origin, find its speed when it has moved 9.0 m
What will be an ideal response?
The photons from the microwave background have not interacted with matter since the universe was how old?
A) 4,000,000,000 years old B) 4,000,000 years old C) 400,000 years old D) 4,000 years old E) 4 seconds old
Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
(1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 8.7 × 10-19 J B) 3.1 × 10-19 J C) 1.3 × 10-19 J D) 2.4 × 10-19 J E) 4.5 × 10-19 J
In a Hertzsprung-Russell (H-R) diagram, points near the top of the diagram represent very low luminosity stars and points near the bottom represent very luminous stars
Indicate whether the statement is true or false