For the monochromatic emissive power distribution shown in the figure, determine the radiant energy emitted for (a) The full spectrum, and (b) over the wavelength band of 1 to 2 ?m.
What will be an ideal response?
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An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10?31 kg, qe = 1.6 × 10?19 C.)
What will be an ideal response?
A blackbody is a perfect emitter of the radiation it generates
Indicate whether the statement is true or false
Which method of fueling your car is likely to be more energy efficient, and why: gasoline used in a standard car engine or electricity taken from a coal-fueled generating plant and stored in lightweight car batteries? Assume that the batteries
convert electricity to work at 100% efficiency, and that electricity is transported from the power plant to the car at 100% efficiency. A) Gasoline used in a standard car engine, because a car engine's fuel burns hotter and more efficiently than does the coal in a coal-fired power plant. B) Electricity from a coal-fired generating plant, because a car engine is a heat engine, and must follow the second law of thermodynamics, whereas a coal-fired generating plant is not. C) Gasoline used in a standard car engine, because a car engine burns its fuel directly in the automobile rather than miles away at the power plant. D) Electricity from a coal-fired generating plant, because such a plant runs at higher energy-efficiency than does a car engine. E) It wouldn't make any difference, because both the car engine and the generating plant are heat engines and are thus subject to the second law of thermodynamics.
A(n) ____ is 1/60th of a degree
a. precession b. second of arc c. minute of arc d. nadir e. angular diameter