A healthy adult human excretes (on an average) _______ gm of urea/day.

An healthy human breathes_______.

The mean wavelength of light from sun is taken to be 550nm and its mean power is 3.8 xx 10^(26) W. The number of photons received by the human eye per second on the average from sunlight is of the order of

The mean wavelength of light from sun is taken to be 550 nm and its mean power is 3.8 xx 10^(26) W. The number of photons received by the human eye per second on the average from sunlight is of the order of………………