Physics-
General
Easy
Question
The frequency 
corresponding to which energy emitted by a black body is maximum may vary with temperature 
of the body as shown in figure. Which of the curves represents correct variation?
The correct answer is:
According to Wien’s displacement law,
Hence, curve represents the correct variation.
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The type of a motor car contains air at 15 . If the temperature increases to 35 , the approximate percentage increase is (ignore to expansion of tyre)
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The number of solution of the equation
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For a real gas (van der Waal’s gas)
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The count rate for 10g of radioactive material was measured at different times and this has been shown in figure with scale given. The half-life of the material and the total count in the first half value period, respectively are
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