Answer:
4.2 × 10⁻¹⁴s⁻¹
Explanation:
Given parameters:
Wavelength of light = 7.1 x 10²nm
We simplify and express this value in metres(m) to give:
⇒7.1 x 10² x 10⁻⁹m = 7.1 x 10⁽⁻²⁺⁹⁾ m
= 7.1 x 10⁷m
The wavelength is 7.1 x 10⁷m
We use the formula V = fλ
We know that Velocity of light is 3 x 10⁸ms⁻¹
Making f, frequency the subject of the formula gives :
f = V/λ
f = 3 x 10⁸ms⁻¹ / 7.1 x 10⁷m
f = 4.2 x 10⁻¹⁴s⁻¹
