In the fissioning of uranium, a chain reaction is caused by
A) the kinetic energy of the decay products.
B) ejected neutrons.
C) alpha particles.
D) none of the above
Answer: B
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The absorption lines in the visible portion of the spectrum of a star that are produced by hydrogen are from the
a. Lyman series. b. Balmer series. c. Paschen series. d. isotopes of hydrogen. e. ions of hydrogen.
The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does d represent?
A) the universal gravitational constant B) the density of the smaller object C) the distance between the two objects D) the diameter of the larger object
The tires of a car support the weight of a stationary car. If one tire has a slow leak, the air pressure within the tire will _______ with time, the surface area between the tire and the road will ________ in time, and the net force the tire exerts
on the road will ___________ in time. A) decrease, increase, remain constant B) decrease, increase, decrease C) decrease, decrease, decrease D) increase, increase, increase E) decrease, increase, increase
Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choice.)
A) The higher-frequency waves have shorter wavelengths than the lower-frequency waves. B) The higher-frequency travel faster than the lower-frequency waves. C) The wavelengths of the visible waves are some of the longest electromagnetic waves. D) The wavelengths of the visible waves are some of the shortest electromagnetic waves. E) The electric field vector is always at right angles to the magnetic field vector.