Question

The momentum of a photon associated with a microwave of wavelength 4.00 cm is ______.

Options

• 1.66 × 10⁻³² kg ms⁻¹

• 1.83 × 10⁻³⁴ kg ms⁻¹

• 2.05 × 10⁻³⁴ kg ms⁻¹

• 1.66 × 10⁻³⁴ kg ms⁻¹

Answer 1

The momentum of a photon associated with a microwave of wavelength 4.00 cm is 1.66 × 10⁻³² kg ms⁻¹.

Explanation:

Given: λ = 4.00 cm = 0.04 m

Momentum (p) = `(6.63 xx 10^-34)/0.04`

= 1.6575 × 10⁻³² kg ms⁻¹

Rounding to appropriate significant figures gives 1.66 × 10⁻³² kg ms⁻¹.