Which of the following statements is (are) NOT true about the emission of the photoelectrons from metallic surfaces?

i. all metallic surfaces emits the same number of photoelectrons in a given light

ii. most metallic surfaces emit the same number of photoelectrons in visible and infra-red light

iii. a metallic surface emits photoelectrons only if the frequency of the incident light is higher than its own characteristics threshold frequency

Similar Questions

The process through which free electrons leave the surface of hot metal is known as? ...

The shortest length of the air column in a resonance tube at resonance is 0.12m and the next resonan...

Which of the following cannot be used to measure the temperature of a substance? ...

In doping an intrinsic semiconductor to produce a p-type semiconductor, ...

A moving-coil galvanometer which gives a full-scale on deflection with 0.005A is converted to a volt...

If the radius of the earth is 6.4 x 10$^6$m, the escape velocity of a satellite from the earth is?...

The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on t...

A hydrometer is an instrument used in measuring? ...

A wave of weight length 0.30m travels 900m in 3.0s, calculate its frequency ...

If a concave lens of focal length 12cm is used to produce a real image four times the size of t...