Q)
(chatquestion)...Two stars A and B radiate maximum energy at wave lengths 4000Å and 5000Å respectivey. The
ratio of their temperature will be –
(1) 1: 2
2.66
(2) 2:1
(3) 4 :5
(4) 5: 4
Q.67 Wein's displacement law is shown by the following relation 2T=b then the curve drawn between
log T and log m wil be -
(1)Log Am
Log m
(2)
(3) Log m
(4) Log 2m
Log T
Log T
Log T
Log T
D.68 A continuous flow water heater (geyser) has an electrical power rating=2kW and efficienty of conversion
of electrical power into heat 80%. If water is flowing through the device at the rate of 100 cc/sec, and
the inlet temperature is 10°C, the outlet temperature will be
%3D
(1) 12.2°C
(2) 13.8°C
(3) 20°C
(4) 16.5°C
...
