Specific heat is 4.2 J/g ------ Explain in 2 or 3 marks
Answers
Answered by
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
Was this answer helpful?
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
Was this answer helpful?
Answered by
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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