If we double only the spring constant of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of .
B) increases by a factor of 2.
C) increases by a factor of 3.
D) increases by a factor of 4.
E) does not change.
Answer: B
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Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same period?
A. I and III, and also II and IV B. I and IV, and also II and III C. I and II, and also III and IV D. All of them have the same period. E. They all have different periods.
An observer will measure the wavelength of waves emanating from a source that is moving away as longer than it really is
Indicate whether the statement is true or false
Why do terrestrial planet cores contain mostly metal?
A) The entire planets are made mostly of metal. B) Metals condensed first in the solar nebula and the rocks then accreted around them. C) Metals are denser than rocks, so they sank to the center when the interiors were molten. D) Radioactivity created metals in the core from the decay of uranium. E) Convection in the mantle carried the metals to the core.
Consider the various frequencies of the three photons emitted from the following three individual electron transitions in the figure below: n=3 to n=2; n=2 to n=1; n=3 to n=1. These transitions would produce three spectral lines in a spectroscope
If the energy spacing between the levels were equal, would this affect the number of spectral lines? A) Yes, two otherwise separate lines would converge into a single more intense line. B) No, but the spacing between the spectral lines would change. C) Yes, two otherwise separate lines would converge into a single less intense line. D) No, but some would then require a prism in order to be seen.