This photograph, taken with a blinking strobe light, shows the path of a bouncing tennis ball. How could we make a similar photograph of the path of a bouncing electron?
A) We couldn't. An electron cannot have a well-defined path like a tennis ball.
B) We'd need to use a strobe that emitted short wavelength x-rays rather than visible light.
C) We'd need to view the electron through a powerful electron microscope.
D) We'd need a strobe that blinked much faster, at least a trillion times per second.
A) We couldn't. An electron cannot have a well-defined path like a tennis ball.
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Other things being equal, the pole-vaulter having the greatest ________ energy prior to going into the jump should jump the highest.
Fill in the blank(s) with the appropriate word(s).
Why should galaxy collisions have been more common in the past than they are today?
A) Galaxies were closer together in the past because the universe was smaller. B) Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars. C) Galaxies were more active in the past and therefore would have collided with each other more frequently. D) Galaxies were much bigger in the past since they had not contracted completely.
A conductor differs from an insulator in that a conductor has more
A) electrons than protons. B) protons than electrons. C) energy than an insulator. D) faster moving molecules. E) none of the above
The true edges of the continental landmasses are called the ______________
Fill in the blank(s) with correct word