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The number of quanta of radiation of fre...

The number of quanta of radiation of frequency `4.98x10^14sec^-1` required to melt 100 gm of ice (latent heat of melting of ice is 33 joul per gm)

A

`10^20`

B

`10^22`

C

`10^24`

D

`6.023x10^(21)`

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The correct Answer is:
B
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Find out the minimum height from which a piece of ice at 0^(@)C should be dropped so that it melts completely. Assume that 50% of the energy lost due to its fall is responsible for the fusion of ice. J = 4.2 xx 10^(7) erg cdot cal^(-1) , latent heat of fusion of ice = 80 cal cdot g^(-1) .

Find out the minimum height from which a piece of ice at 0^(@)C should be dropped so that it melts completely due to its impact with the ground. Assume that half of the energy loss due to the fall is responsible for the fusion of ice. (Latent heat of fusion of ice = 80 cal cdot g^(-1), g = 980 cm cdot s^(-2) , J = 4.2 J cdot cal^(-1))

Find out the amount of work done to convert 100 g ice at 0^(@)C to water at 100^(@)C . (Latent heat of fusion of ice = 80 cal cdot g^(-1) , mechanical equivalent of heat = 4.2 J cdot cal^(-1)) .

Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were -8° C each ? (Specific heat of ice is 2100 Jkg^(-1)K^(-1) and Latent heat of fusion of ice is 3.36 xx 10^5 Jkg^(-1) )

Find out the minimum height from which a piece of ice should be dropped to the ground so that it melts completely. Assume that 20% of energy is lost. J = 4.2 xx 10^(7) erg cdot cal^(-1) and latent heat of fusion of ice = 80 cal cdot g^(-1) .

5 gm of ice at -10^@C are mixed with 20 gm of water at 39^@C . Will whole of the ice melt? If so, what is the final temperature of the mixture? Specific heat capacity of ice = 0.5 cal gm^-1 "^@C^-1 and latent heat of fusion of ice = 80 cal gm^-1 , specific heat capacity of water = 1cal gm^-1 "^@C^-1 .

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