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It takes 20 m...

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It takes 20 min to melt 10 g of ice, when rays from the sun are focussed by a lens of diameter 5 cm on a block ofice. If the latent heat for ice is 80 cal/g, the heat received per unit area per unit time at the surface of earth(in cal cm-2 min-1) is(1) 2.04(3) 0.204(2) 3.04(4) 204

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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}

)

Q. The amount of heat needed to melt

2 k g

of ice at its melting point, when latent heat of ice is

80 c a l / g

(1 c a l = 4.184 J)

Q. A bullet of mass

10 \times 10^{- 3} k g

moving with a speed of

20 m s^{- 1}

hits an ice block

(0^{o} c)

990 g

kept at rest on a frictionless floor and gets embedded in it. If ice takes

50 %

K . E

, for melting, then the mass of the ice block that has melted is(

J = 4.2 J / C a l

) (Latent heat of ice

= 80 c a l / g

)

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