Electromagnetic radiation of wavelength 0.3 pico-meters is which type?
A) gamma rays
B) visible
C) X-rays
D) FM-radio
E) ultraviolet
A
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The experimental observation(s) below that require(s) a quantum explanation for the photoelectric effect
a. is that more photoelectrons are emitted when the light frequency increases. b. is that the maximum kinetic energy of the photoelectrons is related linearly to the frequency of the light. c. is that every metal surface has a work function, a minimum amount of energy needed to free electrons. d. is that the stopping potential measures the kinetic energy of the photoelectrons. e. are all of the above.
The hydrosphere covers about 50% of the Earth's crust
Indicate whether the statement is true or false
As we learned in Chapter 5, the gravitational force between the earth and the sun supplies the centripetal force which causes the Earth to rotate about the sun. Does this force produce a torque about the sun?
A. Yes B. No
If a length of lucite that is being used as a light pipe gets wet, the critical angle
A) decreases. B) is unaffected. C) doubles. D) is meaningless since lucite cannot be used as a light pipe. E) increases.