Double-Slit Interference: Two thin slits are 6.00 ?m apart. Monochromatic coherent light falls on these slits, and produces a fifth-order bright interference fringe at an angle of 32.3° away from the centerline. What is the wavelength of the light?
A. 164 nm
B. 416 nm
C. 614 nm
D. 641 nm
Answer: D
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Thermodynamic Devices: An ideal Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 47 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 237 K. The power requirement to run the heat pump under these operating conditions is closest to
A. 9000 W. B. 7100 W. C. 20,000 W. D. 15,000 W. E. 11,000 W.
What is the stored energy in a 1.5-mH coil carrying a current of 4.0 A?
a. 12 × 10^-3 J c. 8.0 × 10^-3 J b. 4.0 × 10^-3 J d. 2.0 × 10^-3 J
In a series circuit of three identical lamps powered by a 1.5-volt dry cell, the voltage across each lamp is
1) 1/2 V. 2) 1 V. 3) 1-1/2 V. If any one of the lamps is disconnected, the other lamps will 4) go out. 5) continue to glow.
A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1
What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?