What is the frequency of a wave of red light in the air where its wavelength is 6.8×10−7m6.?

Question

units in hz

Answer 1

Speed = Frequency * wave length

 

3*10 ⁸ = Frequency * 6.8 * 10 -7

 

Frequency = 3* 10 ⁸ / 6.8 * 10 -7 = (3 * 10 ¹⁵) / 6.8 Hz = (30 * 10 ¹⁴) / 6.8 = 4.4 * 10 ¹⁴ Hz