When frequency is increased what happens to the amplitude?

For sound, a higher frequency corresponds to a higher pitch while a lower frequency corresponds to a lower pitch. Amplitude corresponds to the loudness of the sound. Since sound at all frequencies has the same speed in air, a change in frequency means a change in wavelength.

a) are muscles that have bands.

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current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete