The diagram shows two waves R and S.
Wave R has an amplitude of $8$ cm and a period of $30$ ms. What are the amplitude and the period of wave S?

amplitude/cm period/ms
A $2$ $10$
B $2$ $90$
C $4$ $10$
D $4$ $90$

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Solution

The correct option is C C
$T_{R} = 3 T_{S}$ , hence $T_{S} = \frac{T_{R}}{3} = \frac{30}{3} = 10 m s$
Also, $A_{R} = 2 A_{S}$ hence $A_{S} = \frac{A_{R}}{2} = \frac{8}{2} = 4 c m$

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The diagram shows two waves R and S.Wave R has an amplitude of 8cm and a period of 30ms. What are the amplitude and the period of wave S?amplitude/cmperiod/msA210B290C410D490

The correct option is C CTR=3TS, hence TS=TR3=303=10msAlso, AR=2AS hence AS=AR2=82=4cm

The diagram shows two waves R and S.
Wave R has an amplitude of $8$ cm and a period of $30$ ms. What are the amplitude and the period of wave S?

amplitude/cm period/ms
A $2$ $10$
B $2$ $90$
C $4$ $10$
D $4$ $90$

The correct option is C C
$T_{R} = 3 T_{S}$ , hence $T_{S} = \frac{T_{R}}{3} = \frac{30}{3} = 10 m s$
Also, $A_{R} = 2 A_{S}$ hence $A_{S} = \frac{A_{R}}{2} = \frac{8}{2} = 4 c m$