The table with pictures below represents the electromagnetic spectrum arranged from the lowest frequency to the highest frequency, numbered 1 to 7 - NSC Technical Sciences - Question 7 - 2022 - Paper 1

The radiation numbered 3 is Gamma.

The radiation numbered 1 is Radio wave.

1. Ultraviolet rays are used to sterilize medical equipment, as they can kill bacteria and other pathogens.
2. They are also utilized in the production of vitamin D in the human body when skin is exposed to sunlight.

A photon of light is defined as a quantum or packet of electromagnetic energy that travels at the speed of light.

To find the energy of the radio waves, we can use the formula: $E = hf$ Where:

• $h = 6.63 \times 10^{-34} \text{ J s}$ (Planck's constant)
• $f = 102.5 \times 10^{6} \text{ Hz}$ (frequency)

Calculating the energy: $E = (6.63 \times 10^{-34}) \times (102.5 \times 10^{6}) = 6.80 \times 10^{-27} \text{ J}$

1. Red
2. Green
3. Blue