Why can light from the sun cause skin cancer but light from a light bulb cannot cause skin cancer? CFS: Explains the difference between sunlight and light from a light bulb Explains what happens when light from the sun hits genetic material Explains what happens when light from a light bulb hits genetic material

Part A

The radiation of the light from the Sun is made both visible light and ultraviolet (UV) light. Statistically, exposure to UV radiation present in Sunlight is the cause of most skin cancer

About 5% of the UV radiation from the Sun that reaches the Earth are UVB radiation which have higher energy than UVA and are taken to be the cause of skin cancer

A light bulb, such as a LED, an incandescent light bulb, or a sodium vapor lamp emit very small amount of UV and are well within the safe limits of exposure, therefore, the do not cause skin cancer

Part B

The difference between light from the Sun (sunlight) and light from a light bulb includes;

Sunlight is composed of the entire colours of the spectrum while artificial light emits limited energy for light in the red and blue spectrum region of light

Sunlight is best and preferred by plants for photosynthesis than artificial light

Sunlight is brighter than most artificial light sources

Part C

When light from the Sun hits genetic material, the UV light is absorbed by both the DNA and proteins which can damage the DNA and be a cause of cancer

Part D

The amount of UV light a light bulb emits is normally within the the safe limits and therefore when light from a light bulb hits genetic material, due to the low amount of UV present, there is little or no damage caused by the light from the light bulb

Explanation:

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perspiration and respiration.