The wave speed will be 210 m/sec. The wave speed is found as the product of the wavelength and frequency of the wave.
What is wavelength?
The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The relationship between the wave's wavelength, time, and speed is given as;
Wavelength = speed of wave / time period
[tex]\rm \lambda = \frac{c}{v} \\\\ \rm 30 = \frac{C}{7 } \\\\ C= 30 \times 7 \\\\ C=210 \ m/sec[/tex]
Hence, the wave speed will be 210 m/sec.
To learn more about the wavelength, refer to the link;
brainly.com/question/7143261
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