The biggest biomass of energy on Earth's surface is
(a) Biomass
(b) Solar radiations
(c) Tides
(d) Winds

A metal surface is exposed to solar radiations. Which of the following is true?

A hot body will radiate maximum energy if its surface is

The energy required to remove a body of mass m from earth's surfac is/are equal to

Choose the incorrect statement from the following: (a) ozone is a molecule formed by three atoms of oxygen (b) ozone shields the surface of the earth from ultraviolet radiations (c) ozone is deadly poisonous. (d) ozone gets decomposed by UV radiations

Solar energy is converted into ATP in or Light energy is converted into chemical energy in the presence of (a) Chloroplasts (b) Pyremoids (c) Ribosomes (d) Mesosomes

The threshold frequency for a metallic surface corresponds to an energy of 6.2eV and the stopping potential for a radiation incident on this surface is 5 V . The incident radiation lies in

The sun having surface temperature Ts radiates like a black body. The rasius of sun is Rs and earth is at a distance R from the surface of sun. Earth absorbs radiations falling on its surface from sun only and is at constant temperature T. If radiations falling on earth's surface are alomost parallel and earth also radiates like a blackbody, then

What is biomass ? What can be done to obtain bio-energy using biomass ?

An earth- orbiting satellite has a solar energy collecting panel with total area 5 m^2 If solar radiations are perpendicular and completely absorbed, the average force associated with the radiation pressure is (Solar constant = 1.4 k Wm^(-2) )

The threshold frequency for a metallic surface correponds to an energy of 6.2 eV , and the stopping potential for a radiation incident on this surface 5 V . The incident radiation lies in