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No other thermometer is suitable as a platinum resistance thermometer to measure temperatures in the entire range of
100 g of ice is mixed with 100 g of water at 100°C. What will be the final temperature of the mixture ?
Let the finaltemperatureof mixturebe T.
Then 100 × 80 + 100 (T – 0) ×½
(as specific heat of ice is 0.5 cal/g C° and specific heatof water is 1 cal/gC°)
= 100 × 1 × (100 –T)
Solving, we get T = 13.33ºC
80 g of water at 30° C are poured on a large block of ice at 0°C.The mass of ice that melts is
80 × 1 × 30 = m × 80 ⇒ m = 30 gm.
The spectral energy distribution of the sun (temperature 6050 K) is maximum at 4753 Å. The temperature of a star for which this maximum is at 9506 Å is
\(\lambda _{1}T_{1}=\lambda _{2}T_{2}\)
6050×4753=9506.T2
T2=3025 K
Two bodies A and B are placed in an evacuated vessel maintained at a temperature of 27°C. The temperature of A is 327°C and that of B is 227°C. The ratio of heat loss from A and B is about
\(\frac{E_{1}}{E_{2}}=\frac{\sigma(T_{1}^{4}-T_{0}^{4}) }{\sigma (T_{2}^{4}-T_{0}^{4})}=\frac{(600)^{4}-(300)^{4}}{(600)^{4}-(300)^{4}}\)
For the construction of a thermometer, one of the essential requirements is a thermometric substance which
The temperature is measured by the value of the thermodynamic property of a substance i.e., theproperty which varies linearly with the temperature.
The temperature of the Sun is measured with
Temperature of stars can be determined by Wein’s displacement law
λm=constant
The temperature of the Sun is measured with
The thermal capacity of 40g of aluminium (specific heat =0.2 cal g-1°C-1) is
Thermal capacity = 40 × 0.2 = 8 cal °C-1
At a certain temperature for given wave length , the ratio of emissive power of a body to emissive power of black body in same circumstances is known as