JEE Main & Advanced Sample Paper JEE Main Sample Paper-8

DIRECTION (Qs. 47): Each of these questions contains two statements: Statement-1 (Assertion) and Statement-2 (Reason). Choose the correct answer (Only one option is correct) from the following - This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement 1: When an electrical heater is switched on, the colour of the filament gradually changes from red to yellow to almost white.

Statement 2: Wien's displacement law states that \[{{\lambda }_{m}}T=b\] (constant) where symbols have their usual meaning.

A) Statement -1 false, Statement-2 is true.

B) Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1

C) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1

D) Statement -1 true, Statement-2 is false.

Correct Answer: B

Solution :

\[T\uparrow \lambda \uparrow ;\] red \[\to \] yellow, \[{{\lambda }_{r}}>{{\lambda }_{y}}\]