An electron and a positron (antielectron), both nearly at rest, collide. What particle(s) is(are) produced?
a. One photon of energy 1.02 MeV
b. Two photons of energy 511 keV
c. A pi-meson
d. A K-meson and an anti-neutrino
b
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Spherical Mirrors: When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?
A. 27 cm B. 40 cm C. 80 cm D. 160 cm
How are elements heavier than iron made? Why are they rare?
What will be an ideal response?
The most common rocks in Earth's crust are
a. sedimentary. b. metamorphic. c. igneous. d. lava.
Consider possible standing wave patterns for a string fastened at each end. Discussion in the text shows that there is a
A. maximum possible amplitude. B. maximum possible frequency. C. maximum possible wavelength. D. minimum possible wavelength.