A diagram of an electromagnetic spectrum is given below - NSC Technical Sciences - Question 7 - 2024 - Paper 1

One practical application of the waves marked C (Microwaves) is their use in food warmers.

Electromagnetic radiation protection features are necessary due to the high frequency and penetrating ability of ultraviolet radiation. Overexposure to this type of radiation can cause significant damage to the human body, including skin burns and an increased risk of skin cancer. Therefore, adequate protection is essential to minimize health risks.

To calculate the energy of the photons, we can use the formula:

$E = hf$

where:

• $h = 6.63 \times 10^{-34} \text{ J s}$ (Planck’s constant)
• $f = 2.3 \times 10^{14} \text{ Hz}$ (frequency of the wave)

Substituting the values:

$E = (6.63 \times 10^{-34}) \times (2.3 \times 10^{14})$

Calculating this gives:

$E \approx 1.52 \times 10^{-19} \text{ J}$