Ways to increase emf in solenoid
1. Use a stronger magnet.
2. Increase the speed of moving the magnets.
3. Increase the number of turns on the coil.
Ways to increase emf in a.c. generator
1. Decrease distance between the magnet and coil.
2. Use a stronger magnet.
3. Increase speed of moving the magnets
4. Increase number of turns in the coil.
(emf refers to electromotive force, which can also be considered as ‘voltage’)
When a water wave moves from deep to shallow, ‐ Wavelength become shorter ‐ Frequency remains the same ‐ Speed becomes slower
Extra info: Temperature can be measured using the following methods:
- Expansion of fixed mass of liquid.
- Changes of resistance of a piece of metal with time.
- Expansion of gas at constant pressure.
Factors that affect speed of sound
1. Temperature – The higher, the faster
2. Medium – Solid is faster than liquid, which is faster than gas
3. Humidity – More humid faster than less humid
Characteristics of Image formed on plane mirror
1) Same size
2) Laterally inverted
3) Image is virtual
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