Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion


Which of the following is true as regards photo emission?

[A]. Velocity of emitted electrons is dependent on light intensity
[B]. Rate of photo emission is inversely proportional to light intensity
[C]. Maximum velocity of electron increases with decreasing wave length
[D]. Both holes and electrons are produced

Answer: Option C


As wavelength decreases, frequency increases and maximum velocity of electron increases.

Vini said: (Jun 16, 2015)  

Manav said: (Jul 20, 2016)  
Lambda = velocity/frequency which means lambda is directly proportional to frequency. Then how do velocity increases when wavelength decreases?

Manav said: (Jul 20, 2016)  
Lambda is directly proportional to velocity.

Lovi said: (Aug 5, 2016)  
I think Lambda is inversely proportional to frequency.

Nav said: (Dec 12, 2017)  
λ = c/f.

F=c/λ c is velocity f light so if lambda decreases then 'f' increases it results to velocity increase.

Simran said: (Aug 16, 2018)  
Here, E=hf= mv^2/2.

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