Atoms can be excited by
A) thermal agitation.
B) electron impact.
C) photon impact.
D) all of the above
E) none of the above
Answer: D
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You see colors in a rainbow because of
a. interference. b. diffraction. c. specular reflection. d. dispersion. e. polarization.
Aluminum rod #1 is 1.0 m long with cross-section area 2.0 cm2 . Aluminum rod #2 is 2.0 m long with cross-section area 4.0 cm2 . Aluminum rod #3 is 3.0 m long with cross-section area 9.0 cm2 . If each rod has the same temperature difference applied across its ends, which rod has the greatest rate of transfer of energy between its ends?
a. #1 b. #2 c. #3 d. #2 = #3, both greater than #1 e. They each have the same rate.
Type II supernovae are believed to occur when the cores of massive stars collapse
Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
Someone comes to your house selling a device that draws heat from groundwater and supplies that heat to your house. The salesperson claims that the amount of heat energy entering the house will far exceed the electrical energy supplied to the device. What the salesperson claims here is physically impossible.