Electromagnetic radiations propagate in vacuum with a velocity of _______________ metre/second?

Related Mcqs:

Pick out the wrong statement ?

A. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation B. Filmwise condensation takes place on non-wettable surfaces C. The boiling point of a solution is affected by liquid head as well as boiling point elevation D. None of these...

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

A. 0.2 D B. 0.5 D C. 0.66 D D. 0.80 D...

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

A. Nucleate B. Local C. Pool D. Saturated...

Pick out the correct statement ?

A. Higher is the temperature of the radiating body, higher is the wavelength of radiation B. Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder C. The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature D. Solid angle subtended by the finite surface at … Pick out the correct statement ?Read More...

Prandtl number is the ratio of________________?

A. Momentum diffusivity to mass diffusivity B. Momentum diffusivity to thermal diffusivity C. Thermal diffusivity to mass diffusivity D. Thermal diffusivity to momentum diffusivity...