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
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Physics F5C4

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

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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

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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
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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

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🦋*ੈ✩‧₊˚ 『 @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
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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 😄