In an experiment on a 90 v-notch the flow is collected in a 0.9 m diameter vertical cylindrical tank. it is found that the depth of water in the tank increases by 0.685 m in 16.8 s when the head over the notch is 0.2 m. determine the coefficient of discharge of the notch.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?