Question

What is the energy of a photon of light having a wavelength of 4.5 x 10-7 meters? (Planck’s constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s)

Answer 1

Energy of photon = hc/λ . { h = planck constant. c = speed of light. λ = wavelength.}. Energy = 6.626 x 10^-34 x 2.998 x 10^8 / 4.5 x 10^-7 = 4.41 x 10^-19

Answer 2

Answer:

4.4x10⁻¹⁹ J

Explanation:

The energy of a photon is given by the equation:

• E = hc/λ

Where h is Planck's constant, c is the speed of light and λ is the wavelength.

Putting the data given by the problem we're left with.

• E = 6.626x10⁻³⁴J·s * 2.998x10⁸ m/s ÷ 4.5x10⁻⁷m

• E = 4.4x10⁻¹⁹ J

So the answer is 4.4x10⁻¹⁹ J.