The average intensity of the sunlight in Miami, Florida, is 1060 W/m2. What is the average value of the force exerted on a 16m2 surface that absorbs this light?
A) 7.83 × 10-5 N
B) 1.63 × 10-5 N/m2
C) 2.61 × 10-5 N
D) 5.65 × 10-5 N
E) 0.204 × 10-5 N
D
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Two stars of different mass move directly toward each other. As the distance between the stars decreases, the speed of the stars
A. stays the same for both. B. stays constant for the smaller one and decreases for the larger one. C. gets smaller for both. D. stays constant for the larger one and increases for the smaller one. E. increases for both.
A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light,
which of the following statements are correct? (There could be more than one correct choice.) A) The kinetic energy of the ejected electrons doubles. B) The speed of the ejected electrons doubles. C) The number of electrons ejected per second doubles. D) Twice as many photons hit the metal surface as before. E) None of the above things occur.
When an electron goes from an excited state to the ground state,
a. energy is absorbed. b. a photon is absorbed. c. a photon is emitted. d. none of these occur.
It is not possible to resolve detail of objects smaller than the wavelength of the radiation being used
Indicate whether the statement is true or false