What did Thomson discover about the electron that changed a long-accepted idea about atoms?
a. That electrons are negatively charged.
b. That electrons do not respond to a magnetic field.
c. That electrons are smaller than atoms.
d. That electrons respond to an electric field.
e. That they were ionized.
c
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The larger terrestrial planets have surface features that tend to be
A) more cratered. B) older. C) younger. D) more rocky. E) more icy.
Suppose you have a time-keeping device that always reads precisely 12:00 when the Sun crosses your meridian. What kind of time is this clock keeping?
A) mean solar time B) standard time C) apparent solar time D) universal time
A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground. How long is the ball in flight before it hits the ground?
A) 1.22 s B) 6.79 s C) 7.45 s D) 9.14 s E) 2.44 s