In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy:
a. is half the kinetic energy of the electron.
b. is equal to n2 times the kinetic energy of the electron.
c. is equal to the kinetic energy of the electron.
d. is twice the kinetic energy of the electron.
D
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To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water?
A) 2.3 s B) 2.6 s C) 2.9 s D) 3.2 s E) 3.6 s
What do we mean when we say that the Sun is in gravitational equilibrium?
A) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity. B) The Sun maintains a steady temperature. C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. D) The Sun always has the same amount of mass, creating the same gravitational force.
The process by which molecules escape from a solid directly into the gas phase is called
A) gasification B) evaporation C) condensation D) sublimation
One type of event that may generate gravity waves of sufficient strength to be detected with current equipment is the death spiral of a neutron star as it plunges into a black hole
Indicate whether the statement is true or false