The content is just an excerpt from the complete note for SS3 Second Term Physics Lesson Note – Radioactivity. Check below to download the complete DOCUMENT
WEEK TWO
RADIOACTIVITY
Radioactivity
Radioactivity is the spontaneous decay or disintegration of the nucleus of the atom of an element during which it emits α, β or γ rays or a combination of any or all the three and energy ( or heat). Examples of radioactive elements are uranium, radium, radon, thorium, polonium, etc. These all have high atomic number (>82)
| Radiation | Alpha(α)particles | Beta(β) Particles | Gamma (γ)rays |
| Nature | Helium nuclei 42He | High Energy electrons | Electromagnetic wave of short wavelength |
| Velocity | 5 – 7% speed of light | Travel at approximate speed of light | Travel at speed of light |
| Nature of charge | Positively charged | Negatively charged | Neutral |
| Effects of magnetic field | Slightly deflected towards the negative plate | Strongly deflected towards the positive plate | No effects |
| Ionizing power | High | low | None |
| Penetrating power | Little penetrating power e.g. thin sheets of paper | Good penetrating power e.g. aluminum | High penetrating power e.g. leads |
| Mass | Massive particle | Small particle | No mass |
RADIOACTIVE DECAY
To gain full access to the note: DOWNLOAD FILE
Do you want to study Agricultural Extension in OOU? Before you apply for the OOU…
Do you want to study Agricultural Economics in OOU? Before you apply for the OOU…
Do you want to study Cooperative and Business Management in OOU? Before you apply for…
Do you want to study Home and Hotel Management in OOU? Before you apply for…
Do you want to study Animal Production in OOU? Before you apply for the OOU…
Do you want to study Crop Production in OOU? Before you apply for the OOU…