Question

Red light with a wavelength of 670.8 nm is emitted when lithium is heated in a flame
What is the frequency of this radiation?​

Answer 1

Answer:

Frequency = 4.5 × 10¹⁴ Hz

Explanation:

Given data:

Wavelength of light = 670.8 nm (670.8 ×10⁻⁹ m)

Frequency of light = ?

Solution:

Speed of light = wavelength × frequency

Frequency = Speed of light / wavelength

Speed of light = 3 × 10⁸ m/s

Frequency = 3 × 10⁸ m/s / 670.8 ×10⁻⁹ m

Frequency = 0.0045 × 10¹⁷ s⁻¹

Frequency = 4.5 × 10¹⁴s⁻¹

s⁻¹ = Hz

Frequency = 4.5 × 10¹⁴ Hz