Question

For a photon with  = 730 nm, determine its speed, frequency, energy, and color.

For frequency the formula would be v=c/lambda

3.00x10^8/7.30x10^-7=2.19x10^14/s

Speed c=(v)(lambda)
C=(v)(lambda)

C= (2.19x10^14/s)(1.37x10^-6)=3.00x10^8 I got the wavelength by doing the formula
Lambda=c/v 3.00x10^8 m/s/2.19x10^14/s =1.37x10^-6

Color would be red

Is this correct?

Answer 1

No. v = c/lambda is right and 3E8/7.30E-7 is right but you must have punched in the wrong numbers because the answer is not 2.19E14. I obtained 4.11E14/Hz

You didn't need to calculate C. You know that;s 3E8 m/s

Likewise, you didn't need to calculate lambda. That's given in the problem as 730 nm so you know 1.37E06 isn't right. You are correct that it is red.