Chemistry question? URGENTTT?

Question

Suppose your favourite AM radio stattion broadcasts at a frequency of 1150 kHz. What is the wavelengh, in centimeters, of the radiation from the station?

Please make it clear so I am able to understand.

Thanks

Answer 1

The equation you need is:

speed of light c = frequency x wavelength
so wavelength = speed of light / freq.
c = 2.998 x 10^8 m/s
wavelength = 2.998 x 10^8 / 1150x 10^3 = 2.607 x 10^2 m
= 2.607 x 10^4 cm

Answer 2

Wavelength x frequency = speed (for any wave motion)

= 2.998 x 10^8 m s-1 for electromagnetic radiation (light, radio waves, etc).

In this case, frequency = 1150 kHz = 1150 thousand Hz = 1150 x 1,000 s-1 (meaning 1150 cycles per second)

You can now find the wavelength. Because of the units used, the answer will automatically be in meters.

Some sadist has demanded centimeters! Confound them! Why do they do this sort of thing? (I mean it)

But since you know that 100 cm = 1m, you just multiply your anser in m by 100.