Radio waves have many uses—the category is divided into many subcategories, including microwaves and electromagnetic waves used for AM and FM radio, cellular telephones and TV.
The lowest commonly encountered radio frequencies are produced by high-voltage AC power transmission lines at frequencies of 50 or 60 Hz. These extremely long wavelength electromagnetic waves (about 6000 km) are one means of energy loss in long-distance power transmission.
Extremely low frequency (ELF) radio waves of about 1 kHz are used to communicate with submerged submarines. The ability of radio waves to penetrate salt water is related to their wavelength (much like ultrasound penetrating tissue)—the longer the wavelength, the farther they penetrate. Since salt water is a good conductor, radio waves are strongly absorbed by it; very long wavelengths are needed to reach a submarine under the surface.
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Answer: 6
Explanation:
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Answer:
D. The liquid is a mixture because it has a gas dissolved in a liquid.
Answer:
Explanation:
For an object moving in uniform circular motion, the centripetal acceleration is given by:
where
v is the tangential speed
r is the radius of the circle
In this problem, we have:
r = 0.146 m is the radius of the circle
v = 1.23 m/s is the tangential speed
Substituting the numbers, we find:
