Advertisements
Advertisements
प्रश्न
Which of the following pairs may give equal numerical values of the temperature of a body?
विकल्प
Fahrenheit and Kelvin
Celsius and Kelvin
Kelvin and Platinum
Advertisements
उत्तर
Fahrenheit and Kelvin
Let θ be the temperature in Fahrenheit and Kelvin scales.
We know that the relation between the temperature in Fahrenheit and Kelvin scales is given by
`(T_F-32)/180 =(T_K-273.15)/100`
`T_F=T_K=theta`
Therefore,
`(theta-32)/180=(T_K-273.15)/100`
5θ -160 = 9θ -2458.5
4θ = 2298.35
θ = 574.59°
If we consider the same for Celsius and Kelvin scales
`(T_C-0)/100 =(T_K-273.15)/100`
Let the temperature be t
`(t-0)/100 = (t-273.15)/100`
t = t - 273.15
Thus, t does not exist.
The Kelvin scale uses mercury as thermometric substance, whereas the platinum scale uses platinum as thermometric substance. The scale depends on the properties of the thermometric substance used to define the scale. The platinum and Kelvin scales do not agree with each other. Therefore, there is no such temperature that has same numerical value in the platinum and Kelvin scale.
APPEARS IN
संबंधित प्रश्न
The dimensions of emissive power are ______.
A pinhole is made in a hollow sphere of radius 5 cm whose inner wall is at temperature 727oC. Find the power radiated per unit area. [Stefan’s constant σ = 5.7 x 10-8 J/m2 s K4 , emissivity (e) = 0.2]
Compute the temperature at which the r.m.s. speed of nitrogen molecules is 832 m/s. [Universal gas constant, R = 8320 J/k mole K, molecular weight of nitrogen = 28.]
The susceptibility of magnesium at 300K is 1.2 x 10-5. At what temperature will the susceptibility increase to 1.8 X 10-5?
The kinetic energy per molecule of a gs at temperature T is ________.
(a) `(3/2)RT`
(b) `(3/2)K_BT`
(c) `(2/3) RT`
(d) `(3/2)("RT"/M)`
A body cools from 80° C to 70° C in 5 minutes and to 62° C in the next 5 minutes. Calculate the temperature of the surroundings.
The length of a brass rod is found to be less on a hot summer day than on a cold winter day as measured by the same aluminium scale. Can we conclude that brass shrinks on heating?
The density of water at 4°C is supposed to be 1000 kg m–3. Is it same at sea level and at high altitude?
A spherical shell is heated. The volume changes according to the equation Vθ = V0 (1 + γθ). Does the volume refer to the volume enclosed by the shell or the volume of the material making up the shell?
Water equivalent of a body is measured in ___________ .
A metre scale made of steel is calibrated at 20°C to give correct reading. Find the distance between the 50 cm mark and the 51 cm mark if the scale is used at 10°C. Coefficient of linear expansion of steel is 1.1 × 10–5 °C–1.
The densities of wood and benzene at 0°C are 880 kg m3 and 900 kg m–3 , respectively. The coefficients of volume expansion are 1.2 × 10–3 °C–1 for wood and 1.5 × 10–3 °C–1for benzene. At what temperature will a piece of wood just sink in benzene?
Explain the meaning of heat and work with suitable examples.
Temperature and Heat are ______
Two objects are said to be in thermal contact if they can exchange heat energy.
Give reasons for the following:
Hot metal ball of 80° C is dipped into water of 80°C. The ball will not contract.
Which formula gives the average kinetic energy per molecule of an ideal gas?
