00:01
Okay, we have electromagnetic waves and sound waves that have the same frequency, and we're trying to find the wavelength of both.
00:12
So this is gonna use the equation, velocity equals the wave's frequency times its wavelength.
00:21
In other words, the wavelength will be equal to the speed of the wave divided by its frequency.
00:28
So for part a, this is an electromagnetic wave, so what's its wavelength? well, what's its velocity? the speed of light, right? c, divided by the frequency, which is 1 .2 kilohertz.
00:45
This gives our wavelength 250 ,000 meters.
00:54
So, very long.
00:56
B, we have, this is a sound wave now.
01:02
So the speed of the wave is the speed of sound, which they gave as 341 meters per second...