A.Zero
B.0.1 to 0.5
C.0.5
D.0.5 to 1
E.Unity
Related Mcqs:
- The emissivity of a body will be equal to absorptivity when
- The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation, is known as
- When a body is in thermal equilibrium with its surroundings, the absorptivity and the emissivity of the body are same. This Law is known as
- Emissivity and absorptivity of a surface are equal for radiation
- A grey body has emissivity
- A relationship between the temperature of a black body and the wavelength at which the maximum value of monochromatic emission power occurs, is established under
- The resultant upward pressure of a fluid on a floating body is equal to the wirght of the fluid displaced by the body. This is known as
- Two large closely spaced concentric spheres (both of which are perfect black body radiators) are maintained at temperatures of 127?C and 27?C respectively. The space in between the two spheres is evacuated. Taking Stefan Boltzmann constant as 5.67 x 108 watt m2K the rate of radiation in watts per sq. m between the two spheres is approximately
- A floating body displaces a volume of liquid equal to
- The maximum velocity of a body in SHM with amplitude of 150 mm and a frequency 2 vibrations/sec is equal to
