Basic Concept Of X-Rays
1. X-rays are also known as Roentgen rays.
2. Production of x-rays is inverse phenomenon of photoelectric effect.
3. X-rays are electromagnetic waves of wavelength 1A°-100A°.
4. X-rays aren't deflected by electric & magnetic field.
5. X-rays of smaller wavelength are called hard x-rays.
6. Coolidge tube is used to produce x-rays.
7. Production of X-rays is an atomic phenomenon while of gama rays is a nuclear phenomenon.
8. X-rays are produced when fast moving electrons strike a target of high melting point & high atomic weight (like tungesten,platinum etc).
9. Only about 1%of incident electrons energy is converted into x-rays & the remaining 99% into heat.
10. Intensity of x-rays is measured by ionisation chamber.
11. X-rays can't be used in RADAR because x-rays aren't reflected by metals.
12. X-rays can cause P.E effect & ionization of atoms.
13. H-atom can't emit x-rays as its energy levels are too close to each other.
14. If x-rays are passed through successive aluminium sheets,their hardness remains unchanged.
15. The energy & penetrating power of x-rays depend on potential difference across the filament & target .
Uses of X-rays
1. To investigate structure of crystals.
2. To detect cracks & flaws in metal casting.
