1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
If $$\lambda $$m denotes the wavelength at which the radioactive amission from a black body at a temperature TK is maximum, then
A
$${\lambda _m}\, \propto \,{T^4}$$
B
$${\lambda _m}$$ is independent of T
C
$${\lambda _m}$$ $$ \propto $$ T
D
$${\lambda _m}\, \propto \,{T^{ - 1}}$$
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-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
A
$${2 \over 3}K$$
B
$$\sqrt 2 K$$
C
3 K
D
$${4 \over 3}K$$
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Unit of Stefan's constant is
A
watt m2 K4
B
watt m2/K4
C
watt/m2 K
D
watt/m2K4
4
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
For a black body at temperature 727oC, its radiating power is 60 watt and temperature of surrounding is 227oC. If temperature of black body is changed to 1227oC then its radiating power will be
A
304 W
B
320 W
C
240 W
D
120 W
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