Question

Electromagnetic radiation with a wavelength of 640 nm appears as orange light to the human eye. The frequency of this light is _______ s.

A. 4.688 x 10^5
B. 4.688 x 10^14
C. 1.920 x 10^2
D. 1.920 x 10^11
E. 2.133 x 10^-15

Answer 1

The frequency of light with a wavelength of 640 nm is 4.688 x 10^14 s^-1.

Step-by-step explanation:

The frequency of light can be determined using the equation:

c = λv

Where c is the speed of light (approximately 3.00 x 10^8 m/s), λ is the wavelength, and v is the frequency.

To find the frequency of light with a wavelength of 640 nm, we need to convert the wavelength to meters:

640 nm = 640 x 10^-9 m

Now we can plug the values into the equation:

c = λv

3.00 x 10^8 m/s = (640 x 10^-9 m)v

Solving for v, we get:

v = (3.00 x 10^8 m/s) / (640 x 10^-9 m)

v = 4.688 x 10^14 s^-1

Therefore, the frequency of this light is 4.688 x 10^14 s^-1 (option B).