Class 12 Physics | Photoelectric Effect | #2 Threshold Frequency | For JEE & NEET

[@g.srinivasrao1674]

Sir really nice explanation ......... Thank you so much for your efforts . But u can make a video of one hour rather than making each video of 5min or 2mins ......

[@loveliteraturebyom9205]

sir can i start from modern physics even i m not so much strong in electricity and magnetism plz reply sir

[@physicsgalaxyworld]

Yes you can...

[@yashagarwal9080]

will photoelectric effect start when hv (thershold)= work function

[@physicsgalaxyworld]

+Yash Agarwal its a limiting value when electrons will just be able to come out of surface. if surface is not grounded, due to positive charge these will be re absorbed...

[@virendrachouhan1554]

Sir but in previous you told electron only absorb certain type of phtons which energy differcence between orbitals

[@roneet9027]

Thanks a lot sir

[@amirganaie4404]

What if frequency of light is equal to the threshold frequency?

[@physicsgalaxyworld]

Then the electrons will eject with almost no kinetic energy...

[@calculus3097]

Sir videos are not in proper sequence in the playlist

[@fantasgeek1643]

Best ❤️ ❤️

[@p.ramyashri4110]

Can each electron absorb only one photon/one quanta of energy??? Can't it absorb 2-3 photons to reach it's threshold value?

[@arunteltia7888]

P.Ramyashri no our sirtold us that it is being experimented with the low energy photon since 20 years and still the e does not come out

[@p.ramyashri4110]

Arun teltia yes I got that....

[@arunteltia7888]

P.Ramyashri ok

[@soumiksaha48thdimension]

​@@p.ramyashri4110 Hi, The answer to your query is very logical and can be understood well through an analogy. Consider a metal bar, you can heat the metal as many as times and as long as possible but it won't melt, until its melting point is reached through heat supply, even though in the former case the heat supply might have been much more than in the latter case. This is because the heat supplied is not important but the reaching of melting point is the criteria. This again can be attributed to the fact that temperature is not additive in nature even though heat is. Similarly frequencies are not additive in nature and you cannot a particular frequency by providing an energy( photon) more than once or for a long time. To cause an emission, the frequency must be greater than or equal to the threshold frequency. In case its equal to the threshold frequency, the electron from a conduction bands will just reach the metal surface and would be absorbed by the metal lattice soon if the metal surface is not grounded.

[@soumiksaha48thdimension]

Another analogy can be ignition of a matchstick where the match would not light however much heat you provide to it unless the ignition temperature is reached even though the heat supplied to the system in in reaching the temperature might as well be lower then the net heat is supplied at lower temperature.

[@Future_iitian_]

😊

[@psychofaiz7000]

4 sep 2020

[@shivanshpandey7957]

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[@abhishektak245]

Please remove the English subtitles

[@ishangupta9386]

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[@BTMECJAYTHAKUR]

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[@ameykulkarni2688]

on what drugs are you on?