# Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

47.

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

Explanation:

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

 Vini said: (Jun 16, 2015) V=Lambada*Frequency.

 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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