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प्रश्न
Estimate the average thermal energy of a helium atom at the temperature on the surface of the Sun (6000 K).
उत्तर
On the surface of the sun, T = 6000 K
Average thermal energy = `3/2` kT
`= 3/2 xx 1.38 xx 10^(-38) xx 6000`
`= 1.241 xx 10^(-19)` J
Hence, the average thermal energy of a helium atom on the surface of the sun is 1.241 × 10–19 J.
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(a) What does the dotted plot signify?
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Oxygen is filled in a closed metal jar of volume 1.0 × 10−3 m3 at a pressure of 1.5 × 105Pa and temperature 400 K. The jar has a small leak in it. The atmospheric pressure is 1.0 × 105 Pa and the atmospheric temperature is 300 K. Find the mass of the gas that leaks out by the time the pressure and the temperature inside the jar equalise with the surrounding.
Match the following:
|
|
Column A |
Column B |
|
(a) |
cm3 |
(i) Pressure |
|
(b) |
Kelvin |
(ii) Temperature |
|
(c) |
Torr |
(iii) Volume |
|
(d) |
Boyle's law |
(iv) `"V"/"T" = ("V"_1)/("T"_1)` |
|
(a) |
Charles's law |
(v) `"PV"/"T" = ("P"_1 "V"_1)/"T"_1` |
|
|
|
(vi) PV = P1V1 |
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