00:01
Good day, the topic is about speed of a wave.
00:04
Wave is a disturbance in space.
00:06
Given with its wavelength and frequency, we get to solve with the speed of a wave as equal to the product of lambda, where lambda is the wavelength and f is the frequency.
00:15
Suppose we have a radio wave or a radio signal, which frequencies are given to be 500 to 1 ,600 khz, and also another that is in the range of 88 to 108 megahertz.
00:30
We note that radio waves travel at the speed of light which is equal to 3 times 7 to the power of 8.
00:36
In both ranges, we wish to find the wavelength in terms of meters.
00:42
So first, we rewrite the equation above in terms of wavelength as follows.
00:50
We have lambda equals v over f.
00:54
So let us recall the units, v is in meters per second, and f is frequency in hertz.
01:01
Means we have to express kilohertz and megahertz into hertz.
01:06
So first let's have 550 kilohertz.
01:12
Kilohertz or kilo means 10 to the power of 3...