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2 Cards in this Set
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Brownian Motion
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Introduce smoke to a small glass container.
View the well illuminated container through a microscope. Focus the microscope on the relatively large smoke particles, which will appear as tiny dots of light. You will observe 'random' motion of the particles which is a consequence of the multiple collisions with air molecules inside the container. |
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S.H.C
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Use a block of metal of mass m with two holes drilled into it: one for an electrical heater and the other for a temperature sensor that can be connected to a data logger. The metal is well lagged, and the heater is switched on. A graph of temperature (θ) against time (t) is then plotted. Either the power (P) of the heater needs to be known, or both the current (I) and potential difference across the heater (V) need to be measured.
The plotted graph will show a reasonably straight line from a little time after switch on until switch off, although temperature may rise a little after switch off. Power of heater = VI c = E / (mΔθ) = (VIt) / (mΔθ) = ((VI) / (m)) * (1 / (gradient of graph)) |
