Henri Becquerel
A) discovered radium and polonium.
B) discovered radioactivity.
C) observed back-scattering from nuclei.
D) invented the particle detector tube.
E) proposed the tiny central nucleus idea.
B
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As magma cools, the first minerals to crystallize are those with a _______.
What will be an ideal response?
The number of significant figures in 0.01500 is
A) two. B) three. C) four. D) five.
James Prescott Joule's experiments, such as stirring a container full of liquid, showed that
A) thermal energy is actually a form of energy. B) the "Newtonian" energy forms [kinetic, gravitational, elastic] are conserved. C) all forms of energy are conserved. D) Mr. Joule did not know how to make a good batch of chili. E) radiant energy is actually a form of energy.
This figure is a diagram of a multiflash image of an air puck moving to the right on a horizontal surface. The images sketched are separated by equal time intervals, and the first and last images show the puck at rest. In figure c, which color graph best shows the puck’s velocity as a function of time?