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what are the si unit of amplitude,freqency&wavelength

SI unit of amplitude is metre (m)

as amplitude is the maximum displacement suffered by the particles of the medium from their mean positions during the wave propagation.

SI unit of displacement is metre.

so, SI unit of amplitude is metre.

SI unit of frequency is Hertz (Hz).

1Hz means that an event repeats once per second. A previous name for this unit was cycles per second

SI unit of wavelength is metre (m)

wavelength is usually a length of wave (distance between two adjacent crests or troughs of a wave is known as wavelength) and units of length is usually measured in metres (m).

so, SI units of wavelength is metre(m)

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SI unit is meter (m) and time period of a pendulum independent of its mass if you take acceleration due to gravity and length constant.<<this is for amplitude

The  SI unit of frequency is Hertz.

The SI unit of wavelength is also Meter(m).

Thumps up please! :)

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Amplitude is metre

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frequency  is  hertz    and  the si unit of wavelength is meters 

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In SI units, the unit of frequency is the hertz (Hz),

amplitude is a measure of distance so its SI unit is meter (m)

There is no special SI unit of amplitude. It is the maximum lenght of an oscillation swing

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