Early AM radios required very long antennae wires. FM antennae are often approximately a meter in size. Can you surmise why sensitive FM aerials are much smaller than those AM wires?
What will be an ideal response?
A sensitive aerial has a size related to the wave length of the radiation (e.g. ?, ?/2, ?/4). AM, having a frequency a thousand times lower than FM, has wavelengths a thousand times larger, and early radios required a very sensitive antenna, unlike modern radios which have enormous amplification capability.
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How does Jupiter's core compare to Earth?
A) It is the same size and mass. B) It is about 10 times larger both in size and mass. C) It is about 10 times larger in size and the same mass. D) It is about the same size but is 10 times more massive. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
Gold has a melting temperature of 1063?C and a latent heat of fusion of 12,700 J/mole.
A negative potential energy may be made positive by changing the ______________ point
Fill in the blank(s) with correct word
Ozone production via automobile emissions ________
a. is usually associated with photochemical smog b. can help restore the ozone being depleted in the outer atmosphere c. is eliminated by appropriate use of catalytic converters d. will provide overall worldwide reduction in skin cancer