electromagnetic radiation question!?

2 ⤊

electromagnetic radiation question!?

Electromagnetic radiation at the blue end of the visible spectrum has a wavelength of 400 nm. Calculate the frequency of the radiation.

2007-10-12 09:26:16 · 3 answers · asked by Darly F 1 in Science & Mathematics ➔ Physics

3 answers

speed of light = frequency * wavelength

Frequency = 3e8 / 4e-7 = 7.5e14 Hz

2007-10-12 09:33:47 · answer #1 · answered by Anonymous · 1⤊ 0⤋

velocity = wavelength x frequency
since the velocity of all electromagnetic waves = 3 x (10 ^8)

then the frequency of the radiation = (3 x 10^8) / (400 x 10^-9)
= 7.5 x (10^14) Hz

2007-10-12 16:36:19 · answer #2 · answered by 1101-1001 2 · 1⤊ 0⤋

300,000,000/w=f
300 x 10^6/400 x 10^-9 = .75 x 10^15
750,000,000,000,000 Hz or 750,000 GHz (gigahertz).

2007-10-12 16:38:45 · answer #3 · answered by Joseph F 5 · 0⤊ 0⤋