How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?
a. The electron doesn't come from the nucleus—it comes from an orbit circling the nucleus.
b. A neutron in the nucleus turns into a proton, electron, and a neutrino.
c. A proton in the nucleus turns into a neutron, electron, and a neutrino.
d. none of the above
B
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A sound wave in helium has an intensity of 
The density of helium is 0.179
and the velocity of sound in helium is 965 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
By itself, ________ makes up 70% of the masses of all the planets combined
Fill in the blank(s) with correct word
The statement "It will be 87°F today" is an example of what
What will be an ideal response?
According to Kepler's second law, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is at the other focus of the ellipse?
a. nothing b. the Earth c. The comet itself passes through the other focus. d. The tail of the comet stays at the other ellipse.