1.

The thresthold frequencey for photoelecric emission of electrons from platinum is 1.3xx10^(15)s^(-1). Which of the following statements is not correct?

Answer»

the number of electrons ejected from the metal surface will DEPEND upon the the intensity of radiation having frequency `le1.3xx10^(15)s^(-1)`.
The radiation having energy `1XX10^(-20)J` will be ABLE to cause photoelectric efect.
If radiation having frequency `1.3xx10^(14)s^(-1)` strikes theplatinum suface, photo-electrons will not be ejected.
The kinetic energy of the emittedelectrons will increasse with increase in frequency provided it is greater than `1.3xx10^(15)s^(-1)`.

Solution :Threshold frequency `v_(0)=1.3xx10^(15)s^(-1)` and threshold energy
`hv_(0)=6.6xx10^(-34)xx1.3xx10^(15)`
`=858xx10^(-19)J`
Therefore OPTION b , c and d are correct. Option A is not correct.


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