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Specific heat...

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Specific heat of water is 4.2 J/g^°C. If light of frequency 3 109Hz is used to heat 400 gm of water from 20^°C to 40^°C, the number of photons needed will be

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Q. Specific heat of water is 4.2

J / g^{\circ} C

. If light of frequency 3 x

10^{9}

Hz is used to heat 400 gm of water from

20^{\circ} C

40^{\circ} C

the number of photons needed will be

Q. Specific heat of water is

4.2 J / g^{o} C

. If light of frequency

3 \times 10^{9} H z

is used to heat

400 g m

20^{o} C

40^{o} C

, the number of photons needed will be?

Q. Specific heat of water is

4.2 J/kg K

. If light of frequency

4 \times 10^{9} Hz

is used to heat

100 gm

20^{\circ} C

100^{\circ} C

. The no. of photons required will be,

Q. Calculate the mass of ice required to lower the temperature of

300 g

40 ° C

0 ° C

. (Specific latent heat of ice = 336 J /g, Specific heat capacity of water = 4.2 J/ g°C).

Q. How much heat energy is released when

5 g

20^{o} C

changes to ice at

0^{o} C

?
[Specific heat capacity of water

= 4.2 J g^{- 1} C^{- 1}

.
Specific latent heat of fusion of ice

= 336 J g^{- 1}

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