Thermodynamic Devices: A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump?
A. 3.9
B. 4.9
C. 2.9
D. 0.26
E. 22
Answer: B
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A metal having a work function of 2.5 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm
For which one of the following ranges of the wavelength band in this white light are photoelectrons NOT produced? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 500 nm to 700 nm B) 400 nm to 560 nm C) 500 nm to 560 nm D) 400 nm to 500 nm E) 560 nm to 700 nm
The first law of thermodynamics is basically a special version of the law of ______________
Fill in the blank(s) with correct word
The distance between the ruled lines on a diffraction grating is 1770 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the longest wavelength that appears in the third order spectrum? A) 590 nm B) 570 nm C) 550 nm D) 530 nm E) 610 nm
People can snorkel down to a depth of roughly one meter. This means that the additional pressure on the air in their lungs is roughly
a. 9 800 N. b. 9 800 Pa. c. 9 800 ATM. d. 19 600 N. e. 19 600 N/m2.