In a laser the emitted light is __________
Fill in the blank(s) with correct word
monochromatic, coherent
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The magnetic fields of Uranus and Neptune are peculiar in that they are
a. highly inclined to their planet's axis of rotation. b. very weak (virtually zero). c. produced by the solar wind. d. produced by disturbances caused by the orbits of the moons. e. all of the above
A telescope that is 1.0 meter in diameter has a focal length of 10 meters. An eyepiece with a focal length of 0.01 meters that is used with this telescope would have a magnification of ____________________?
Fill in the blank(s) with correct word
The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg of water in the tank from 15°C to 80°C? (The specific heat of water is 4 186 J/kg°C)
If a radio wave has speed 3.00 × 10^8 m/s and frequency 99.7 MHz, what is its wavelength?
a. 8.78 m c. 2.78 m b. 1.50 m d. 3.01 m