10.1 Define the term electromagnetic waves - NSC Technical Sciences - Question 10 - 2021 - Paper 2

The electromagnetic wave with the longest wavelength is the radio wave.

The electromagnetic wave with the highest frequency is the gamma rays.

To determine the energy of the photon:

Using the formula: $E = hf$ Where:

• $h = 6.63 \times 10^{-34} \, J \, s$ (Planck's constant)
• $f = 7.50 \times 10^{14} \, Hz$ (frequency)

Substituting the values gives:

$E = (6.63 \times 10^{-34} \, J \, s)(7.50 \times 10^{14} \, Hz) = 4.97 \times 10^{-19} \, J$

Since the energy of this photon is more than that of a blue light photon (1.75 x 10^-48 J), it can be concluded that it is a photon of indigo light.