Sound Wave Electromagnetic Spectrum

Sunny protection

Too much sun can be harmful. So be aware of how you can protect yourself.

WE live in a country where we do not think much about the sun shining on our faces. It is simply there, providing light and heat to us, 365 days a year.

However, as we become more conscious of the effects of UV rays on our skin and health, we have learnt to be more careful with sun exposure. Many women now carry an umbrella when they walk in the sun, wear hats while gardening, and put on sunscreen lotion when they go out of the house.

Choosing the right sunscreen can be confusing. The shelves of pharmacies and supermarkets are often filled with rows and rows of sunscreen products with dizzying variations of names, numbers and claims.

What is the right sunscreen for you, and how much does it help you? What else do you need besides sunscreen to protect yourself? I hope to answer some of these questions below.

UV dangers

Sunlight contains ultraviolet (UV) rays, which is part of the electromagnetic spectrum emitted from the sun. You cannot actually see UV rays with the naked eye, as its wavelengths are shorter than that of visible light.

There are three ranges of UV rays within this spectrum: UVA, UVB, and UVC. The first two wave ranges, UVA and UVB, are the ones that penetrate the atmosphere and reach our skin.

UVA rays are long-wave rays that penetrate deeply into the skin, while UVB are short-wave rays that only enter the skin’s superficial epidermal layers.

UV rays do have beneficial effects because they help the body to make vitamin D, which is important for strong bones and teeth. Sunlight is the only known natural source of vitamin D, so we cannot shun the sun completely.

However, too much exposure to UVA and UVB rays can lead to harm. UVA is known to damage the DNA in skin cells, which could contribute to skin cancer and suppression of the immune system. UVA also causes skin wrinkling, premature ageing, age spots, and loss of tone and elasticity.

electromagnetic spectrum? what do color and pitch have in common ...

It goes from radio (long wavelengths, low frequency) through visible light all the way up to gamma radiation (very short wavelengths, very high frequency).

What we perceive as sound is vibrational mechanical energy that moves through matter as a wave.

So even though both light and sound are waves, they are not the same phenomenon – sound is not part of the EM spectrum, it is the result of vibration moving through matter as waves.

If you have trouble differing, think about a small and a large flashlights, both red: they have the same frequency but different intensity. A blue flashlight will have a different frequency. You can probably think of an analogy for sound as well.

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