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The electrical resistance in ohms of a c...

The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law:
`R = R_(0) [1 + alpha (T - T_(0))]`
The resistance is `101.6 Omega` at the triple-point of water `273.16 K , " and " 165.5 Omega` at the normal melting point of lead `(600.5 K)`. What is the temperature when the resistance is `123.4 Omega`?

Text Solution

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The correct Answer is:
361K
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The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law : R=R_(0)[1+alpha(T-T_(0))] The resistance is 101.6Omega at the triple-point of water 273.16 K and 165.5Omega at the normal melting point of lead (600.5)K. What is the temperature when the resistance is 123.4Omega ?

A gas thermometer measures the temperature from the variation of pressure of a sample of gas. If the pressure measured at the melting point of lead is 2.20 times the pressure measured at the triple point of water find the melting point of lead.

Knowledge Check

  • The resistance of a thermometer is 100 Omega at the triple point of water ( 273 K) and is 300 Omega at the melting point of gold (~873K). The temperature at which the resistance of the thermometer is 200Omega is

    A
    273 K
    B
    373 K
    C
    473 K
    D
    573 K

  • The value of temperature coefficient of resistance thermometer is

    A
    low and negative
    B
    low and positive
    C
    high and negative
    D
    high and positive

  • The value of temperature coefficient of resistance thermometer is

    A
    low and negative
    B
    low and positive
    C
    high and negative
    D
    high and positive

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