The wavelength of a wave is 20cm.fifteen of these waves move past a point per second.calculate da frequency
To calculate the frequency of a wave, you need to know the wavelength and the speed of the wave. In this case, you have been given the wavelength of the wave, which is 20 cm. However, the speed of the wave is not specified in the question. Therefore, we cannot directly calculate the frequency without the speed.
If you have the speed of the wave, you can use the formula:
Frequency = Speed / Wavelength
Let's assume that the speed of the wave is v (in cm/s). Since fifteen of these waves move past a point per second, we can conclude that the speed of the wave is also 15 times the wavelength per second.
Therefore, the speed (v) can be calculated as:
v = 15 x 20 cm/s
v = 300 cm/s
Now that we have the speed (v) and the wavelength (20 cm) of the wave, we can calculate the frequency:
Frequency = v / Wavelength
Frequency = 300 cm/s / 20 cm
Frequency = 15 Hz
So, the frequency of the wave is 15 Hz.