Assertion : A tube light emits white light. Reason : Emission of light in a tube takes place at a ve

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10-2.Transmission of Heat

easy

$Assertion :$ A tube light emits white light.
$Reason :$ Emission of light in a tube takes place at a very high temperature.

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2003)

Solution

In tube light, the gas contains vapour of metals. In metallic atoms, electronic transition occurs due to which light of a particular wavelength is emitted. So
emission of white light is due to electronic transition and not due to vibration of atoms as in hot substances. So, Assertion is correct but Reason is incorrect.

Standard 11

Physics

Two metallic spheres ${S_1}$ and ${S_2}$are made of the same material and have identical surface finish. The mass of ${S_1}$ is three times that of ${S_2}$. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of ${S_1}$ to that of ${S_2}$ is

hard

(IIT-1995)

A very thin metallic shell of radius $r$ is heated to temperature $T$ and then allowed to cool. The rate of cooling of shell is proportional to ……..

easy

A bowl filled with very hot soup cools from $98^{\circ}\,C$ to $86^{\circ}\,C$ in $2$ minutes when the room temperature is $22^{\circ}\,C$. $……….\,minutes$ long it will take to cool from $75^{\circ}\,C$ to $69^{\circ}\,C$ ?

medium

(JEE MAIN-2023)

On what does the proportionality constant depends given in Newton's law of cooling.

easy

Newton's law of cooling is used in laboratory for the determination of the

easy

$Assertion :$ A tube light emits white light. $Reason :$ Emission of light in a tube takes place at a very high temperature.

Solution

Similar Questions

A very thin metallic shell of radius $r$ is heated to temperature $T$ and then allowed to cool. The rate of cooling of shell is proportional to ……..

A bowl filled with very hot soup cools from $98^{\circ}\,C$ to $86^{\circ}\,C$ in $2$ minutes when the room temperature is $22^{\circ}\,C$. $……….\,minutes$ long it will take to cool from $75^{\circ}\,C$ to $69^{\circ}\,C$ ?

On what does the proportionality constant depends given in Newton's law of cooling.

Newton's law of cooling is used in laboratory for the determination of the

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$Assertion :$ A tube light emits white light.
$Reason :$ Emission of light in a tube takes place at a very high temperature.