Question
A wave pulse on a string has the dimension shown in figure. The waves speed is $v = 1 \,\,cm/s$. If point $O$ is a free end. The shape of wave at time $t = 3 \,\,s$ is :
✓
Answer
In three seconds, the distance travelled by wave=1 $c m / s \times 3 s=3 c m$
Hence the center of the wave, the crest, reaches the point $O '$ in the time.
The amplitude of the wave becomes $1 \mathrm{cm}+1 \mathrm{cm}=2 \mathrm{cm}$
Hence correct answer is option $D.$
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