Question

What is the frequency of light (s-1) that has a wavelength of 1.23 × 10-6 cm? Speed of light = 3.00 × 108 m/s.

Please with explanation and calculation

A) 2.44 × 1016 s-1

B) 1.04 × 10-13 s-1

C) 4.10 × 10-17 s-1

D) 9.62 × 1012 s-1

E) 2.44 × 1014 s-1

Answer 1

A

Step-by-step explanation:

You can use the equation C=fL

where C is speed of light

f is frequency

L (Lamda) is wavelength

C = fL

3×10⁸ m/s = f × 1.23 × 10^-6 × 10^-2 m

f = 3×10⁸/ 1.23×10^-8

f = 2.44 × 10¹⁶ s-1

here wavelength is given in cm and we need to substitute the value in m (SI units) in order to get the answer for frequency in s-1

so to convert cm to m we divide the equation by 100 or simply multiply it by 10^-2 as shown above