Conduction: On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical properties of these materials?
A. density
B. specific heat
C. emissivity
D. thermal conductivity
E. mass
Answer: D
You might also like to view...
Which interacts more with high-frequency sounds?
A) large bells B) small bells C) both the same
A particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
A) is brought to a rapid halt. B) decelerates gradually to a halt. C) continues at the same speed it had before encountering the second force. D) theoretically tends to accelerate toward the speed of light. E) none of the above
In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 2 level, the circumference for its orbit becomes 4 times greater. This occurs because
a. there are four times as many wavelengths in the new orbit. b. the wavelength of the electron becomes four times as long. c. there are twice as many wavelengths, and each wavelength is twice as long. d. the electron is moving four times as fast.
A series circuit contains a 20-? resistor, a 200-mH inductor, a 10-?F capacitor, and an ac power source. At what frequency should the power source drive the circuit in order to have maximum power transferred from the driving source?
A) 0.11 kHz B) 0.45 kHz C) 0.96 kHz D) 0.17 kHz E) 0.28 kHz