A. Krichoff’s law
B. Stefan’s law
C. Wien’ law
D. Planck’s law
E. Black body law
A. less than those for gases
B. jess than those for liquids
C. more than those for liquids and gases
D. more or less same as for liquids and gases
E. zerci
A. absolute temperature
B. T2
C. T5
D. t
E. l/T
A. p = 0, x = 0 and a = 1
B. p= l,T = 0anda = 0
C. p = 0, x = 1 and a = 0
D. x = 0, a + p = 0
E. a = 0,x + p= 1.
where a = absorptivity, p == reflectivity, X = transmissivity
A. temperature
B. thickness
C. area
D. time
E. area and time
A. 0.45
B. 0.55
C. 0.40
D. 0.75
E. 0.60
A. temperature
B. wave length
C. physical nature
D. all of the above
E. none of the above
A. absorptive power
B. emissive power
C. absorptivity
D. emissivity
E. none of the above
A. nature of body
B. temperature of body
C. type of surface of body
D. all of the above
E. none of the above
A. at all temperatures
B. at one particular temperature
C. when system is under thermal equi-librium
D. at critical temperature
E. for a polished body