Thermal physics experiments

Question 1

What are the 2 practicals here?

Answer 1

1. Estimation of Absolute Zero by use of the Gas Laws
2. Measurement of the Specific Heat Capacity for a Solid

Question 2

Elaborate 1.
(Geeeeeneral)

Answer 2

• Charles’ law:
• Constant amount of gas, V proportional to absolute temp.
• if pressure remains constant. AKA:
• V α T for constant P
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• Plot graph: volume versus Centigrade temperature
• … intercepts x-axis at -273°C suggesting
• gas would occupy no volume at this temperature
  ^^^
• Theoretical value known as absolute zero
• aka 0 kelvin
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• Use graph to find absolute zero with eqn of straight line:
• l = mθ + c
• Calc. gradient and find intercept
• Find θ for l = 0

Question 3

Elaborate 2.
(General chat.)

Answer 3

To find value for specific heat capacity
(ASSUMING NO ENERGY LOSS):
- Electrical energy supplied by the heater =
- heat received by the block
- IVt = mc(θ₂ - θ₁)
- c = (IVt)/(θ₂ - θ₁)m
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- Can also plot graph of temp. vs time
- Intercept is θ₁
- Gradient is IV/mc

Question 4

Still summarise better?

Answer 4

,’:P