If you move an electron from the ground state to a higher energy level, the atom becomes an excited atom
a. True
b. False
Indicate whether the statement is true or false
True
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A thermodynamic engine has an efficiency of 31.4% and receives 8.72 kJ of energy per cycle. (a) How much work does it perform in each cycle? (b) How much energy does it exhaust in each cycle?
What will be an ideal response?
In a demonstration, a 4.00 cm2 square coil with 10 000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4 000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 × 10^-3 cm. b. 0.015 cm. c. 7.5 cm. d. 13 cm. e. 15 cm.
A Michelson interferometer is used to measure the thickness of a thin film with light of wavelength 560 nm. If the film has index of refraction 1.39, and thickness 56.7 microns, a change in the interference pattern of how many bright fringes will result from the introduction of the film into the interferometer?
A. 281 B. 141 C. 78 D. 79 E. 280 F. 140
If no molecular collisions occurred in a sample of gas, temperature of the gas would
A) increase. B) decrease. C) be unaffected.