Effective Mass And Velocity Of Electron In Periodic Potential 

Sir, I am from Bangladesh. Just I want to say awesome. There are lots of video i searched. Your explanation too much easy and fruitful,sir. May you live long,sir.

I'm from Nepal. M. Sc physics student. I like your lec. Nice keep it up sir ji.

Ultimate teaching skills

Bhaiya aapke samaghane ka tarika gajab ka h ...... Thnks bhaiya

you are the best teacher i have ever seen thanks

You're the best teacher sir thanks very well explained 🎉

Superb explanation 👍🏻👍🏻truely the best videos on youtube for physics 👍🏻👍🏻

Honestly ur teaching is really awesome and it's so beneficial for MSc students.......keep it up.......plzz upload many more videos regarding MSc syllabus topics and also on condensed matter physics.....

Well explained

Thank you so much sir very nice explanation 😊

Dear Bhaiya , You are so good at this , plz continue what you are doing and also kindly make videos on other topics of Bsc/MSc physics. Would love to understand more physics from you ❤️

nice one

superb explanation

Superb explain sir . I wish more videos in solid state physics🙏

Great Teacher

Well explained❤

Nice bhai bahut accha padhate ho keep it up

Great jnb ♥️

very well explained:),thnx a lot. but i have a question, at origin the slope of curve is zero, but the graph of effective mass does not show the infinity value, like that it shows on the point AM and NB. kindly explain

❤❤ thank you sir

AT 8:19, Energy is not negative. It is still on positive y-axis.

Nice explanation

Sirji Did you try to impersonate physics wallah🎉😂❤

Thanks sir

The explanation of effective mass is not at all justified. Very lucid and clear explanation is available in text books

The explanation of graph is not correct

Bro if u speak english, then its useful for everyone.

Sir dont say sorry other wise i am not see your videos😢