Characteristic x-rays can be produced by bombarding targets with electrons. These x-rays occur when
a. electrons from higher shells fill the vacant lower shell
b. electrons fill the vacant valence shell
c. photons are emitted with energies on the order of 103 eV
d. photons are emitted with wavelengths on the order of 103 nm
a
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Most of the moons of Saturn have rocky, cratered surfaces, like Deimos and Phobos
Indicate whether the statement is true or false
When a colored light in air shines on water and is refracted, its frequency
A) decreases. B) remains unchanged. C) increases.
A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero. b. its speed continues to increase while its acceleration goes to zero. c. both the speed and the acceleration increase. d. its speed decreases while its acceleration continues to increase. e. its speed slows to zero while its acceleration reaches a terminal value.