AIPMT 2009 | Properties of Matter Question 67 | Physics

AIPMT 2009

MCQ (Single Correct Answer)

-1

A black body at 227^oC radiates heat at the rate of 7 cals/cm²s. At a temperature of 727^oC, the rate of heat radiated in the same units will be

112

AIPMT 2008

MCQ (Single Correct Answer)

-1

On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39^oW and 239^oW respectively. What will be the temperature on the new scale, corresponding to a temperature of 39^oC on the Celsius scale ?

200^oW

139^oW

78^oW

117^oW

AIPMT 2007

MCQ (Single Correct Answer)

-1

A black body is at 727^oC. It emits energy at a rate which is proportional to

(1000)⁴

(1000)²

(727)⁴

(727)²

AIPMT 2007

MCQ (Single Correct Answer)

-1

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t^oC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
where $$\sigma $$ is the Stefan's constant.

$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {4\pi {R^2}}}$$

$${{16{\pi ^2}{r^2}\sigma {t^4}} \over {{R^2}}}$$

$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}}$$

$${{4\pi {r^2}\sigma {t^4}} \over {{R^2}}}$$

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