An ordinary loudspeaker should not be placed next to a computer monitor or TV screen. Why not? (Please explain in complete details)
Added by Scott R.
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Step 1: Large speakers contain powerful magnets that can interfere with the magnetic field of a computer monitor or TV screen. Show more…
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Loudspeaker “A” produces a loud musical tone when played by itself. Loudspeaker “B” also produces the same loud musical tone when played by itself. However, when both loudspeakers are played together and close to each other, there is very little sound heard. Is this possible? Yes, because of constructive interference. No, because the resulting frequency is too high to hear. Yes, because of the Doppler effect. Yes, because of destructive interference. No, because the resulting sound must be louder than either speaker by itself.
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The human ear can detect sound waves whose intensity is about $10^{-12} \mathrm{W} / \mathrm{m}^{2} .$ Where should you be with respect to a stereo speaker that produces sound of intensity $10^{-5} \mathrm{W} / \mathrm{m}^{2}$ when $1 \mathrm{m}$ from the speaker if you do not want to listen to the music? (a) About $3 \mathrm{m}$ away (b) About $30 \mathrm{m}$ away (c) About $3 \mathrm{km}$ away (d) It depends on the size of the speaker.
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