Only photons with wavelengths _____ can ionize hydrogen
A) shorter than 91.2 nm
B) longer than 104.3 nm
C) shorter than 40 nm
D) longer than 80 nm
A
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Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas c. solid b. liquid d. substance undergoing a change of state
The source of electrons in an ordinary electric circuit is
A) a dry cell, wet cell, or battery. B) usually a wall socket. C) a generator at the power station. D) the electric conductor itself. E) none of the above
The unit of resistance is named after
A) Isaac Newton. B) Benjamin Franklin. C) Georg Simon Ohm. D) Micheal Faraday. E) Charles Coulomb.
A piece of chocolate melts in your mouth. This is an example of
a. heat conduction. b. heat convection. c. heat radiation. d. thermal expansion. e. none of the above.