AIPMT 2004 | Properties of Matter Question 77 | Physics

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

$${4 \over 3}K$$

AIPMT 2002

MCQ (Single Correct Answer)

-1

Consider two rods of same length and different specific heats (S₁, S₂), conductivities (K₁, K₂) and area of cross-sections (A₁, A₂) and both having temperatures T₁ and T₂ at their ends. If rate of loss of heat due to conduction is equal, then

K₁A₁ = K₂A₂

$${{{K_1}{A_1}} \over {{S_1}}} = {{{K_2}{A_2}} \over {{S_2}}}$$

K₂A₁ = K₁A₂

$${{{K_2}{A_1}} \over {{S_2}}} = {{{K_1}{A_2}} \over {{S_1}}}$$

AIPMT 2002

MCQ (Single Correct Answer)

-1

For a black body at temperature 727^oC, its radiating power is 60 watt and temperature of surrounding is 227^oC. If temperature of black body is changed to 1227^oC then its radiating power will be

304 W

320 W

240 W

120 W

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