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Thermal Properties of Matter Test - 70

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Thermal Properties of Matter Test - 70
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  • Question 1
    4 / -1
    The rectangular surface of area 8 cm × 4 cm of a black body at a temperature of 127oC emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised to 327oC, the rate of emission of energy will become
    Solution

  • Question 2
    4 / -1
    At temperature T, the power radiated by a body is Q watts. At the temperature 3T the power radiated by it will be
    Solution

  • Question 3
    4 / -1
    Two spherical black of radii r1 and r2 and with surface temperature T1 and T2 respectively radiate the same power. Then, the ratio of r1 and r2 will be
    Solution

  • Question 4
    4 / -1
    Temperature of a black body increases from 327oC to 927oC, the initial energy possessed is 2 KJ, what is its final energy?
    Solution

  • Question 5
    4 / -1
    The original temperature of a black body is 727oC. The temperature at which this black body must be raised so as to double the total radiant energy is
    Solution

  • Question 6
    4 / -1
    The energy spectrum of a black body exhibits a maximum around a wavelength λ0. The temperature of the black body is now changed such that the energy is maximum around a wavelength 3λ0/4. The power radiated by the black body will now increase by a factor of
    Solution

  • Question 7
    4 / -1
    A black body at a temperature of 127oC radiates heat at the rate of 1 cal/cm2 × sec. At a temperature of 527oC the rate of heat radiation from the body in (cal/cm2 × sec) will be
    Solution

  • Question 8
    4 / -1
    The spectral energy distribution of star is maximum at twice temperature as that of sun. The total energy radiated by star is
    Solution

  • Question 9
    4 / -1
    A black body radiates at the rate of W watts at a temperature T. If the temperature of the body is reduced to T/3, it will radiates at the rate of (in Watts)
    Solution

  • Question 10
    4 / -1
    If the temperature of the sun were to be increased from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on the earth to what it was previously will be
    Solution

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