1. The red light associated with the aurora borealis is emitted by excited oxygen atoms. This

light has and energy wave that has a wavelength that measures 630.0 nm.

a. What is the frequency of the light?

b. What is the energy in joules that is emitted?

Convert to kilojoules?

Frequency = 0.005 * 10¹⁷ s⁻¹

E = 0.03 * 10⁻²⁰KJ

Explanation:

Given dа ta:

Wavelength of light = 630.0 nm (630 * 10⁻⁹ m)

Frequency of light = ?

Energy in joule = ?

Solution:

speed of light = wavelength * frequency

Frequency = speed of light / wavelength

Frequency = 3 * 10⁸ m/s / 630 * 10⁻⁹ m

Frequency = 0.005 * 10¹⁷ s⁻¹

Energy:

E = h. f

E = 6.63 * 10⁻³⁴ Kg. m²/s * 0.005 * 10¹⁷ s⁻¹

E = 0.03 * 10⁻¹⁷ j

E = 0.03 * 10⁻¹⁷ j*1 kj / 1000 j

E = 0.03 * 10⁻²⁰KJ