Alpha radiation is in fact which of the following?
a. high energy quanta
c. helium nuclei
b. positrons
d. electrons
C
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Which of these is NOT true about the standard model of elementary particles currently accepted by most physicists?
a. It seems to explain every relevant experiment that can be done. b. It combines two of the four basic forces into an "electroweak" interaction. c. It combines the electroweak interaction with the color interaction. d. It connects the color theory to the strong force. e. It calls for mathematical calculations that are currently impossible.
A solar flare creates a radio disturbance on Earth a few minutes after going off, then again several days later. Explain
What will be an ideal response?
Preston pushes a wheelbarrow weighing 480 N to the top of a 45.0-m ramp, inclined at 22.0° with the horizontal, and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which an 85.0-N frictional force acts on it over the 45.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
a. 1.4E+3 J b. 1.6E+4 J c. 1.2E+4 J d. 8.1E+3 J e. 4.3E+3 J
The ionosphere is an electrified ion-rich area
A) in the uppermost troposphere. B) where atoms lose their electrons and are negatively charged. C) where air density and solar radiation is low. D) within the uppermost mesosphere and thermosphere.