English
Karnataka Board PUCPUC Science Class 11

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

Advertisements
Advertisements

Question

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

Short/Brief Note
Advertisements

Solution

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
  Is there an error in this question or solution?
Chapter 33: Thermal and Chemical Effects of Current - Short Answers [Page 217]

APPEARS IN

HC Verma Concepts of Physics Volume 1 and 2 [English]
Chapter 33 Thermal and Chemical Effects of Current
Short Answers | Q 6 | Page 217

RELATED QUESTIONS

A silver wire has a resistance of 2.1 Ω at 27.5°C, and a resistance of 2.7 Ω at 100°C. Determine the temperature coefficient of resistivity of silver.


A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0°C? The temperature coefficient of resistance of nichrome averaged over the temperature range involved 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?


A non-ideal battery is connected to a resistor. Is work done by the battery equal to the thermal energy developed in the resistor? Will your answer change if the battery is ideal?


Two resistors R and 2R are connected in series in an electric circuit. The thermal energy developed in R and 2R are in the ratio ______________ .


The resistance of an iron wire and a copper wire at 20°C are 3.9 Ω and 4.1 Ω, respectively. At what temperature will the resistance be equal? Temperature coefficient of resistivity for iron is 5.0 × 10–3 K–1 and for copper, it  is 4.0 × 10–3 K–1. Neglect any thermal expansion.


When a current passes through a resistor, its temperature increases. Is it an adiabatic process?


Consider the following statements regarding a thermocouple.
(A) The neutral temperature does not depend on the temperature of the cold junction.
(B) The inversion temperature does not depend on the temperature of the cold junction.


The constants a and b for the pair silver-lead are 2.50 μV°C−1 and 0.012μV°C−2, respectively. For a silver-lead thermocouple with colder junction at 0°C, ______________ .

(a) there will be no neutral temperature
(b) there will be no inversion temperature
(c) there will not be any thermo-emf even if the junctions are kept at different temperatures
(d) there will be no current in the thermocouple even if the junctions are kept at different temperatures


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

Define temperature coefficient of resistance of the material of a conductor. 


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.


An electrical cable of copper has just one wire of radius 9 mm. Its resistance is 5 ohm. This single copper wire of the cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to ______.


By increasing the temperature, the specific resistance of a conductor and a semiconductor -


Water at 10°C enters into a geyser. The water drawn out from the geyser has a temperature of 60°C and the rate of outflow of water is 18 kg/hr. The rating of the geyser is :


The specific resistance of all the metals is the most affected by ______


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×