AIPMT 2006 | Properties of Matter Question 71 | Physics

A black body at 1227^oC emits radiations with maximum intensity at a wavelength of 5000 $$\mathop A\limits^ \circ $$. If the temperature of the body is increased by 1000^oC, the maximum intensity will be observed at

3000 $$\mathop A\limits^ \circ $$

4000$$\mathop A\limits^ \circ $$

5000$$\mathop A\limits^ \circ $$

6000$$\mathop A\limits^ \circ $$

AIPMT 2005

MCQ (Single Correct Answer)

-1

Which of the following rods, (given radius r and length $$l$$) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?

r = r₀, $$l$$ = $$l$$₀

r = 2r₀, $$l$$ = $$l$$₀

r = r₀, $$l$$ = 2$$l$$₀

r = 2r₀, $$l$$ = 2$$l$$₀

AIPMT 2004

MCQ (Single Correct Answer)

-1

If $$\lambda $$_m denotes the wavelength at which the radioactive amission from a black body at a temperature TK is maximum, then

$${\lambda _m}\, \propto \,{T^4}$$

$${\lambda _m}$$ is independent of T

$${\lambda _m}$$ $$ \propto $$ T

$${\lambda _m}\, \propto \,{T^{ - 1}}$$

AIPMT 2003

MCQ (Single Correct Answer)

-1

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is

$${2 \over 3}K$$

$$\sqrt 2 K$$

3 K

$${4 \over 3}K$$

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