10. A sound wave has a frequency of 400 Hz and a wavelength of 20 meters. What is the speed?

Speed of wave is 8000 m/s.

Answer:

Explanation:

Speed is the measure of ratio of distance to time taken to cover that distance. In other words, speed is the measure of how fast the object can be move in a given time interval. So in this case, the wave is considered as object. And wave consists of wavelength in place of distance and frequency as reciprocal of time interval.

So speed of wave is calculated as the product of wavelength and frequency.

As the wavelength is given as 20 m and the frequency is given as 400 Hz, then the speed will be

Speed = wavelength * Frequency = 20 * 400

Speed of wave = 8000 m/s.

So speed of wave is 8000 m/s.