Explanation
As the curve has a st. horizontal portion in the graph which shows that gas can be liquified. Hence the temperature of gas is less than the critical temperature.
For a given volume V, pressure at curve T1 will be lower than that at curve T2 . Therefore P2 > P1. Thus T2 > T1.
The average kinetic energy per molecule of a gas = 3/2 k Tof mass of molecule but depends upon the temperature of the gas which is independent
When rubber is stretched, some work is done against the elasticity of rubber, which appears as elastic potential energy. Due to which the potential energy of rubber increases.
Excess of pressure inside the bubble, p = 4 S/r. So smaller is the radius r, the larger is the excess of pressure p. It means, the pressure of air is more in bubble A than in bubble B. So the air will go from bubble A to bubble B.
Gravitational force remains constant on the falling spherical ball. It is represented by st. line P. The viscous force (F = 6 π η r υ) increases as the velocity increases with time. Hence it is represented by curve Q. Net force = gravitational force-viscous force. As viscous force increases, net force decreases and finally becomes zero. Then the body falls with a constant terminal velocity. It is thus represented by curve R.
Pyrometer can measure temperature from 800°C to 6000°C. Hence, temperature of sun is measured with pyrometer.
Thermoelectric thermometer is based on Seebeck Effect.
Production and measurement of temperature close to 0 K is done in cryogenics.
When salt crystals dissolve, crystal lattice is destroyed. The process requires a certain amount of energy (latent heat) which is taken from the water. In vessel (B), a part of intermolecular bonds has already been destroyed in crushing the crystal. Hence less energy is required to dissolve the powder and the water will be at higher temperature.
If the sheet is heated then both d1 and d2 will increase since the thermal expansion of isotropic solid is similar to true photographic enlargement.
–200oC to 600oC can be measured by platinum resistance thermometer.
Thermoelectric thermometer is used for finding rapidly varying temperature.
By filling nitrogen gas at high pressure, the boiling point of mercury is increased which extends the range upto 500oC.
Since coefficient of expansion of steel is greater than that of bronze, hence with small increase in it's temperature the hole expands sufficiently.
On heating the system; x,r,d all increases, since the expansion of isotropic solids is similar to true photographic enlargement
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