Sub-Atomic Particles
Chapter Name : Structure Of Atom |
Sub Topic Code : 102_11_02_01_03 |
Topic Name : Sub-Atomic Particles |
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Sub Topic Name : Charge On The Electron |
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Introduction
Discuss the oil drop experiment of R.A. Millikan
Pre-Requisites:
e/m ratio for electron
Activity:
If we keep a horse shoe magnet close to electrons, which side does it bend ? Take a small circuit with a bulb and switch. Make connections. Check in what direction is the flow of electricity? Then in what directions do electrons flow?
Real Life Question:
Why are some materials conductors, semi-conductors and insulators? How is matter stable if its basic unit ‘atom’ has unbalanced negative charge ?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Charge on an electron | 1.6022 * 10 -19 c |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Make a chart with differences among sub-particles on it | Go through it a lot many times |
Real life uses :
Working of tubelight\ Electricity
Places to visit :
Physics lab
Practical examples around us
| Examples | Explainations |
|---|---|
| Tubelight All electric appliances work with electricity | when electricity s passed, it causes electrons to travel at high speed and hit the mercury gas producing light. A must see : http://www.youtube.com/watch?v=GnJMvnTnoHU Which is due to flow of electrons |
What you learn in Theory:
Value of charge and mass of an electron
What you learn in Practice:
How scientists detected that charge was negative ? A : When electric field applied around the particles, they bend towards positive charge.