The process of emission of electrons?from metal by UV rays is-
1). Photoelectric emission
2). Thermionic emission?
3). Secondary emission
4). Field emission
1. A small and a large rain drops are falling through air:
2. Name the process of production of energy in the Sun
3. An optically plane surface reflects a beam of light
4. Electron microscope was invented by
5. Weight of a body is maximum at the:
6. Which of the following causes adiabatic temperature changes in atmosphere?
7. Which of the following is optical illusion
8. Water cannot be used to extinguish fire caused by electric current, because