Physics F5C4

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

#physics #f5
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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
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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
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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
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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
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Physics F4C4

Working principle of car radiator system
- combustion of fuel in the engine produces a lot of heat
- the pump forces the water to pass through the hot engine block areas and the water absorb heat
- the specific heat capacity of water is high
- it absorbs a lot of hear
- hot water flows to the radiator and is cooled through a cooling fin.

#physics #f4
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Physics F4C4 essay

Modifications of grill
i) outer coating on grill body : ceramic / porcelain
- high specific heat capacity
ii) additional tool on the grill 1 : lid
- reduce heat loss
iii) additional tool on the grill 2 : fan
- supply more oxygen

#physics #f4
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Physics F5C2 Archimedes' Principle

Essay related to Hydrometer

Thin and long stem
- bigger range of liquid density
Made of glass
- not easy to erode
Large bulb
- greater buoyant force
High density of lead granules
- ensure the hydrometer always upright

#physics #f5
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

Frequently asked question in Physics F4C5

How does a turning fork produce sound waves?
- When a turning fork vibrates, layes or air vibrate.
- The particle of air undergoes series of compression & rarefaction
- Sound energy is propagated through the air in the form of waves

#physics #f4
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

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Haii guys

Korang nak tahu something tak? 🥰
Akk just nak share some cerita/nasihat

Ramai nohh acc sunyi 😂😂😂 understandable 😌👍hahah

Sekadar perkongsian ja🤓✨

One thing I always ask myself sebelum post sesuatu di media sosial...❔

"Adakah benda yg saya tengah tunjuk ni benda baik? Atau adakah aku tengah menayangkan dosaku ?"🤔

Kalaulah aku tayangkan benda yg berdosa❤‍🔥 and then the people who look up to us think it's "RIGHT" to do it sebab kita pun buat😭nampak kecil tp impaknya besar. Kadang kita tak tahu who looks up to us😮 and without realizing mereka turut ikut apa yg kita buat. Benda ni boleh jadi dosa jariah dan akan sentiasa mengalir selagi orang lain melakukan dosa tersebut💢

So basically nasihat akk for adik2 semua is to "tapis" dulu apa yang kita nak kongsi dalam media sosial 🙈✨ apa2pun, thank you sudi baca nasihat akk yg tak seberapa ni🥰🌸

#nasihat

As requested, ini simplified note from our previous class 😄

Assalamualaikum semua