RAYS FROM THE SUN ARE FOCUSSED BY A LENS OF DIAMETER 5 cm ON A BLOCK OF ICE AND 10 g OF ICE IS MELTED N 20 MIN . FIND THE HEAT FROM THE SUN REACHING THE EARTH PER MIN PER SQUARE cm ?

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Q. Rays from the sun are focused by a lens of diameter 5 cm on to a block of ice and 10 g of ice is melted in 20 min. Therefore the heat from the sun reaching the earth per min per square centimetre is
(Latent heat of ice

L = 80 c a l g^{- 1}

)

Q. The rays of sun are focussed on a piece of ice through a lens of diameter

5

cm, as a result of which

10

grams of ice melts in

10

min. The amount of heat received from Sun is (per unit area per min)

Q. Select the correct option given below:
Rays from the sun are focused by a lens of diameter

5 c m

on to a block of ice and

10 g

of ice is melted in

20

min.Therefore the heat from the sun reaching the earth per min per square centimetre is (Latent heat of ice L

= 80 c a l g^{- 1}

)

The diameter of the sun is $1.4 \times 10^{9} m$ and its distance from the earth is $1.5 \times 10^{11} m$ . Find the radius of the image of the sun formed by a lens of focal length 20 cm.

Q. A spherical iron ball of radius

10 cm

is coated with a layer of ice of uniform thickness that melts at a rate of

50 {cm}^{3} /min .

When the thickness of ice is

5 cm

, then the rate at which the thickness

(in cm/min)

of the ice decreases, is:

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