“Thermal radiation suffers no attenuation in a vacuum”.

1.	“Thermal radiation suffers no attenuation in a vacuum”.
A.	True
B.	False
Answer» B. False

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A mercury thermometer with bulb idealized as a sphere of 1 mm radius is used for measuring the temperature of fluid whose temperature is varying at a fast rate. For mercury If the time for the temperature change of the fluid is 3 second, what should be the radius of thermocouple to read the temperature of the fluid?For the thermocouple materialk = 100 W/m Kα = 0.0012 m2/sh = 18 W/m2 K
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“Thermal radiation suffers no attenuation in a vacuum”.
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‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$
Which of the following has units of time constant? (Where, P is density, A is area, c is specific heat and V is volume)

“Thermal radiation suffers no attenuation in a vacuum”.

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