A Carnot refrigerator has a COP of 2.0
(a) What is its efficiency operated as an engine?
(b) Operated as an engine, heat is taken in at 500.°C; what is the exhaust Celsius temperature?
(a) 33.%
(b) 242.°C
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A pre-electronic thermostat employs a coiled
A) wire of low conductivity. B) bimetallic strip. C) tube of mercury.
An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?
A) 6 B) 7 C) 15 D) 33 E) 98
Thin Films: Light has a wavelength of 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.50. What is the wavelength of the light in the glass?
A. 600 nm B. 500 nm C. 400 nm D. 300 nm E. 900 nm
As a block of ice at 0°C melts, the block absorbs energy
A) and decreases in temperature. B) and increases in temperature. C) without a temperature change. D) all of the above E) none of the above