What is a positron?
a. Another name for a proton.
b. Another name for an alpha particle.
c. A charged neutrino.
d. A negatively charged proton.
e. The antiparticle of an electron.
e
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In contrast to Thomson's model of the atom, Rutherford's model
a. had the positive charge spread uniformly through the atom. b. had the positive charge concentrated in a small region. c. was first to explain atoms emitting discrete frequencies. d. eliminated radiation from accelerating charges.
A radar operator on Earth sees two spaceships moving straight at each other, each with speed 0.60c. With what speed does the pilot of one ship see the other ship approaching?
What will be an ideal response?
How are elements beyond iron formed in massive-star supernovae?
A) Elements thrown out at high speeds fuse with hydrogen atoms in the interstellar medium. B) Neutrons produced during the core collapse are slammed into atomic nuclei. C) The high temperature and pressure allow iron nuclei to fuse.
A person in a boat sees a fish in the water (n = 1.33), the light rays making an angle of 40° relative to the water's surface. What is the true angle (in degrees) relative to the water's surface of the same rays when beneath the surface?
a. 40 b. 35 c. 50 d. 55 e. 61