Physics, asked by sulekhaverma8829, 1 month ago

Specific heat is 4.2 J/g ------ Explain in 2 or 3 marks​

Answers

Answered by manavpatel28105
1
Given specific heat =4.2 J/g
0
c frequency ν=3×10
9
Hz ;
T
1

andT
2

=20 and 40 degree celcius respectively.

Energy of each photon
E
P

=hν=(6.62×10
−34
)×(3×10
9
)
=19.86×10
−25
J

Energy absorbed by water to increase its temperature by 20 degree Celsius
=mc
p

△T
=400×4.2×(40−20)
=33.6×10
3
J

Number fof photons needed
=
E
P


E

=
19.86×10
−25

33.6×10
3


=1.69×10
28

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Answered by Spyweb
0

Answer:

Explanation

It means that 4.2 J of heat energy is absorbed by 1g of water to raise its temperature by 1oC.

Explanation -

For liquid at room temperature and pressure, the value of specific heat capacity (Cp) is approximately 4.2 J/g°C. This implies that it takes 4.2 joules of energy to raise 1 gram of water by 1 degree Celsius.

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