Wavelength = 0.4 m
Wave speed = 0.4 . 2 = 0.8 m/s
speed of a wave = wavelength x frequency = 0.4m x 2Hz = 0.8m/s
speed = frequency x wavelength
You solve this as follows: 1) Decide on a number for the speed of sound. Note that the speed of sound in air is quite different to the speed of sound in water, for example. Convert this speed to meters/second, if it isn't already in meters/second. 2) Divide the speed by the wavelength, to get the frequency. 3) The period is simply the reciprocal of the frequency.
122.6cm/(1/14.6)s or 1789.96cm/s or 58.725722ft/s
frequency
speed of a wave = wavelength x frequency = 2.5m x 4Hz = 10m/s
speed of a wave = wavelength x frequency = 0.4m x 2Hz = 0.8m/s
speed = frequency x wavelength
You solve this as follows: 1) Decide on a number for the speed of sound. Note that the speed of sound in air is quite different to the speed of sound in water, for example. Convert this speed to meters/second, if it isn't already in meters/second. 2) Divide the speed by the wavelength, to get the frequency. 3) The period is simply the reciprocal of the frequency.
122.6cm/(1/14.6)s or 1789.96cm/s or 58.725722ft/s
Speed of light in water = speed of light in vacuum/refractive index of water
For any wave, the speed of the wave is the product of its frequency and of its wavelength.
Divide the speed by the wavelength. (For any wave, the wavelength times the frequency is equal to the speed of the wave.)
You find the speed.
The speed of sound in fresh water is approx 1,500 metres per second. So wavelength = speed/frequency = 2.94 metres.
frequency
Wavelength = 0.15 m Wavespeed = 0.15 . 2 = 0.3 m/s