हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

Is Inversion Temperature Always Double the Neutral Temperature? Does the Unit of Temperature Have an Effect in Deciding this Question?

Advertisements
Advertisements

प्रश्न

Is inversion temperature always double the neutral temperature? Does the unit of temperature have an effect in deciding this question?

टिप्पणी लिखिए
Advertisements

उत्तर

If the inversion temperature and neutral temperature are measured in degree Celsius, then it is correct to say that "inversion temperature is always double the neutral temperature." When temperature is measured in other units, such as Kelvin, then inversion temperature is not the double of neutral temperature.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 33: Thermal and Chemical Effects of Current - Short Answers [पृष्ठ २१७]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
अध्याय 33 Thermal and Chemical Effects of Current
Short Answers | Q 6 | पृष्ठ २१७

संबंधित प्रश्न

At room temperature (27.0°C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature coefficient of the material of the resistor is 1.70 × 10−4 °C−1.


The order of coloured rings in a carbon resistor is red, yellow, blue and silver. The resistance of the
carbon resistor is:

a) 24 x 106 Ω ± 5%

b) 24 x 106 Ω ± 10%

c) 34 x 104 Ω ± 10%

d) 26 x 104 Ω ± 5%


Draw labelled graphs to show how electrical resistance varies with temperature for: 

1) a metallic wire.

2) a piece of carbon


Show variation of resistivity of Si with temperature in a graph ?


The thermal energy developed in a current-carrying resistor is given by U = i2 Rt and also by U = Vit. Should we say that U is proportional to i2 or i?


Sometimes it is said that "heat is developed" in a resistance when there is an electric current in it. Recall that heat is defined as the energy being transferred due to temperature difference. Is the statement in quotes technically correct?


As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity ____________ .


The 2.0 Ω resistor shown in the figure is dipped into a calorimeter containing water. The heat capacity of the calorimeter together with water is 2000 J K−1. (a) If the circuit is active for 15 minutes, what would be the rise in the temperature of the water? (b) Suppose the 6.0 Ω resistor gets burnt. What would be the rise in the temperature of the water in the next 15 minutes?


The figure shows an electrolyte of AgCl through which a current is passed. It is observed that 2.68 g of silver is deposited in 10 minutes on the cathode. Find the heat developed in the 20 Ω resistor during this period. Atomic weight of silver is 107.9 g/mol−1.


Find the thermo-emf developed in a copper-silver thermocouple when the junctions are kept at 0°C and 40°C. Use the data given in the following table.

Metal with lead (Pb)

a

`mu V"/"^oC`

b

`muV"/("^oC)`

Aluminium -0.47 0.003
Bismuth -43.7 -0.47
Copper 2.76 0.012
Gold 2.90 0.0093
Iron 16.6 -0.030
Nickel 19.1 -0.030
Platinum -1.79 -0.035
Silver 2.50 0.012
Steel 10.8 -0.016

Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data given in the following table.

Metal with lead (Pb)

a

`mu V"/"^oC`

b

`muV"/("^oC)`

Aluminium -0.47 0.003
Bismuth -43.7 -0.47
Copper 2.76 0.012
Gold 2.90 0.0093
Iron 16.6 -0.030
Nickel 19.1 -0.030
Platinum -1.79 -0.035
Silver 2.50 0.012
Steel 10.8 -0.016

A metallic wire has a resistance of 3.0 Ω at 0°C and 4.8 Ω at 150°C. Find the temperature coefficient of resistance of its material.


A variable resistor R is connected across a cell of emf ε and internal resistance r as shown in the figure. Draw a plot showing the variation of
(i) Terminal voltage V and
(ii) the current I, as a function of R.


In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is ______.

The example of non-ohmic resistance is ______.

Appliances based on heating effect of current work on ______.

The higher and lower fixed points on a thermometer are separated by 160 mm. When the length of the mercury thread above the lower point is 40 mm, the temperature reading would be :


Temperature dependence of resistivity ρ(T) of semiconductors, insulators and metals is significantly based on the following factors:

  1. number of charge carriers can change with temperature T.
  2. time interval between two successive collisions can depend on T.
  3. length of material can be a function of T.
  4. mass of carriers is a function of T.

The temperature (T) dependence of resistivity of materials A and material B is represented by fig (i) and fig (ii) respectively. Identify material A and material B.


fig. (i)

fig. (ii)

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×