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Physics Chapter 6 Paper 1.pdf

Tips for being an A+ Student👩‍🎓👨‍🎓
🕌(Muslim's version)

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Doa elak dibenci

- Ustazah Asma' Harun

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Physics essay about Submarine

Streamlined
- reduce water resistance
Thick wall
- withstand high pressure
Strong material of body
- doesn't break easily
Ballest tank (half full)
- can immerse and float
Additional features: periscope
- to see above the sea

#physics
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Frequently asked question in physics (F5C3)

Why is EHT( extended high tension) used?
To produce high potential differences to move the charge

What's the function of commutator?
Reverse the direction of current of every half rotation to ensure the current flows in the same direction

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Physics F5C4

Why is the magnet in curve shaped?
To produce radial magnetic field & uniform force

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Physics F5C4

How does induction cooker work?
- High frequency alternating current in the coil
- This produces a changing magnetic field
- Eddy current is induced on the bottom of the pan
- Eddy currents produce heat on the pan

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Physics F5C6
Nuclear energy essay

How to handle radioactive source

Use forceps
- Distance btwn source & body is far
Use mask and goggles
- Radiation unable to penetrate the eyes
Use lead box
- prevent radiation leakage to surroundings
Keep exposure time short
- body isn't exposed to dangerous radiation too much
Wear film badge
- detect amount of radiation exposed

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Frequently asked question in Physics F5C5

What's the function of fluorescent screen?
- to convert kinetic energy of the electron to light energy

What's the function of vacuum?
- to prevent collision btwn electrons & air molecules

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Physics F5C5 transistors

1)Amplifier
•The function of microphone: convert sound energy to electric energy
• The function of loud speaker: convert electric energy to sound energy
- When a person speaks through a microphone, the sound waves are converted into an alternating current
- A small change in base current will cause a big change in the collector current
- The loudspeaker thus receives a large alternating current from the collector current and converts it into loud sound.
- The capacitor blocks a steady current (direct current) from flowing into the transistor and microphone

2)Light controlled switch
- At night, the light dependent resistor resistance is very high compared to resistor R
- Base voltage increase > Vbe
- Base current increase
- High enough to switch on the transistor
- The bulb light up

• What if you want the bulb to light up in the morning?
Ans: interchange the position btwn LDR and resistor R

3) Fire Alarm Automatic Switch
- When the thermistor increase, it has smaller resistance
- Thus, the voltage across the resistor R increases and becomes very high
- Base current increases
- Collector current increases
- The bulb light up

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Physics F4C4 Frequent Asked Questions

Why is mercury used in thermometer ?
- Expand uniformly
- Opaque
- Doesn't stick to the glass wall

What is the function of constriction in thermometer?
- to avoid mercury returns back to the bulb
• When we took out the thermometer from the mouth, the temperature will drop
• With constriction, the temperature won't drop.
• Thus, we can read the temperature easily

What are the characteristics of a good thermometer?
1) have thin capillary tube
- increase sensitivity
2) thin wall of bulb
- absorb heat faster
3) small size of bulb
- absorb heat faster

#physics #f4
🦋*ੈ✩‧₊˚ 『 @serenenotes 』