Exposure to the Sun's harmful infrared radiation should be kept to a minimum.

1 answer:

7 0

Of course! If it's harmful, then your exposure to it should be kept
to a minimum. That's a no-brainer. But the sun's infrared radiation
is generally less harmful than its ultraviolet radiation is.

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If the radius of a coinis 20cm, find its surface area -

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Answer:

800 $\pi$ cm²

Explanation:

Given parameters:

radius of the coin = 20cm

Unknown:

Surface area of the coin = ?

Solution:

A coin is made up of two faces;

Surface area = 2(πr²)

Insert the parameters and solve;

Surface area = 2( $\pi x 20^{2}$ )

Surface area = 800 $\pi$ cm²

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2. Which part of a refracting telescope forms the image?

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In a refracting telescope convex lens forms the image.

Answer: c. Convex mirror

Explanation:

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Answer:

I,J,h,g,f,e,d,c,b,a

Explanation:

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