The R value of fiberglass batting, 3.5 inches thick, is 11 ft2/°F/h/BTU. What is the thermal conductivity (in BTU/ft/°F/s)?
a. 7.4 × 10^?6
b. 2.7 × 10^?2
c. 8.9 × 10^?5
d. 1.4 × 10^?4
e. 3.6 × 10^?3
a
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A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
A) 2.05 × 1014 Hz B) 1.02 × 1014 Hz C) 2.50 × 1014 Hz D) 3.53 × 1014 Hz E) 5.92 × 1014 Hz
Radiant energy emitted by our planet is
A) terrestrial energy. B) the outcome of radioactivity in Earth's interior. C) electromagnetic. D) all of the above
Coffee is served at a restaurant before you are ready to drink it. To be hottest when you are ready to drink it, you should add cream
A) right away. B) at any time. C) when you are ready to drink the coffee.
What is the difference in frequency for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m?1.)
a. 5.65 × 10^?13 Hz b. 31 Hz c. 1.77 × 10^12 Hz d. 2.55 × 10^16 Hz e. 1.02 × 10^17 Hz