What is the frequency in mega hertz of a beam of red light whose wavelength is 6000 Angstroms?

Answer 1

The formula to find the frequency is f = c/lambda

c - the speed of light which equals to 3 x 108 m s-1

lambda = 400 nm. nano has mathematical notation 10-9m

Hence required frequency f = 3 x 108 / 400 x 10-9

f = 7.5 x 10 14 Hz.

Answer 2

If you know the wavelength of a beam of light λ and you want to know its frequency ν, use the following formula:

ν = c / λ


where c is the speed of light (2.998×108 meters/second in vacuum).


To address the semantics of the question, 6000 Angstroms is 6000×10-10 meters or, equivalently, 6.000×10-7 meters and a megahertz is 106 hertz.


So, ν = 2.998×108 meters/second / (6.000×10-7 meters) = 0.4997×101 Hz = 4.997 Hz


Which is 4.997×10-6 MHz.

Answer 3

1 Ã…ngstrom = 10-10 meter = 0.1 nanometer

900 Ã…ngstroms = 90 nanometer = 9 x 10-8 meter

(That's no blue light ! That's a hard X-ray.)

Frequency = speed/wavelength = 3 x 108/9 x 10-8 = 31/3 x 1015 Hz = 31/3 million GHz

Answer 4

750 million MHz

Answer 5

7.495*1014 Hz