The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A) It slowly works its way to the Sun's surface, where it escapes into space.
B) It rapidly escapes from the Sun, traveling into space at nearly the speed of light.
C) It is rapidly converted to energy when it meets an ordinary electron, resulting in matter-antimatter annihilation.
D) It quickly meets an ordinary electron, forming an electron-positron pair that remains stable.
E) It joins with a nearby neutron to form a proton.
C
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a. Amino acids b. Starches c. Sugars d. Carboxylic acids
If you are measuring the thickness of a strand of human hair, the most appropriate SI unit is the
A) kilometer. B) meter. C) centimeter. D) millimeter. E) micrometer.
The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar? Is it a "redshift" or "blue shift"?
a. 0; no change b. 2430.5; redshift c. 486.1; blue shift d. 1944.4; blueshift e. 1944.4; redshift
Spherical Mirrors: A beam of light that is parallel to the principal axis strikes a concave mirror. What happens to the reflected beam of light?
A. It also is parallel to the principal axis. B. It is perpendicular to the principal axis. C. It passes through the center of curvature of the mirror. D. It passes through the focal point of the mirror. E. It passes between the focal point and the center of curvature of the mirror.