Let’s Ulangkaji Physics
✨Road to SPM 2022✨
Chapter 7 (F5): Quantum Physics
Skill: Calculation
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Problem solving: Quantum Physics
Interference of light
✨Road to SPM 2022✨
Chapter 5 (F4): Waves
Interference of light wave
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Polaroid
Lens
Revision: LIGHT & OPTICS
✨LENS
💡Clue and idea💡
Comparison:
1. Thickness
= M > N
2. Power
= M > N
3. Focal length
= N > M
4. Size image
= M > N
Relationship:
✏️ thickness increase, power increase
✏️ power increase, focal length decrease
✏️ thickness increase, size of image increase
Answer: C
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Gas Law
Revision: HEAT (Gas Law)
– Boyle’s law
– Charles’ law
– Pressure law
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Idea for Electromagnetism
Let’s Ulangkaji Physics
Revision: ELECTROMAGNETISM
🧲MAGNETIC FORCE
1. resultant force // catapult force
2. interaction between magnetic force in permanent magnet and magnetic force in current carrying conductor
3. Fleming’s Left hand rule
4. Example: motor
5. transformation of energy:
Electrical energy ➡️ Kinetic energy
🚴♀️ELECTROMAGNETIC INDUCTION
1. producing of induced current when there is a cutting (change) in magnetic flux
2. Induced current: producing of current when there is a cutting (change) in magnetic flux due to the relative motion
3. Fleming’s Right hand rule
4. Example: generator
5. transformation of energy:
Kinetic energy ➡️ Electrical energy
6. Lenz’s law: to determine the pole of the solenoid
7. Faraday’s law: induced current increase when rate of cutting flux increase
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Quantum Physics
Let’s Ulangkaji Physics
Revision: QUANTUM PHYSICS
Black Body
– surface that absorb all the electromagnetic radiation
🌡⬆️
= high frequency
= high energy
🌡⬇️
= low frequency
= low energy
Photon
= electromagnetic radiation
Quantum of energy
= light in quanta (packet of energy // discrete energy)
📍E = hf = hc/λ
De Broglie wavelength
= wave-particle duality
📍λ = h/p = h/mv
Photoelectric effect
= emission of photoelectron from metal surface when light at certain frequency illuminates on the metal surface
📍E = hf = hc/λ
f ⬆️, E⬆️
Kinetic energy ⬆️
💡Ek = E -W
1. E < W
Photoelectron: ❌
Ek: ❌
2. E = W
Photoelectron: ✅
Ek: ❌
3. E > W
Photoelectron: ✅
Ek: ✅
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Refraction of light (n = H/h)
Let’s Ulangkaji Physics
Revision: LIGHT & OPTICS
REFRACTION OF LIGHT
n = H/h
nh = H
Optical Density of liquid increase
Refractive index of liquid increase
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Modification: Formula 1 car
Let’s Ulangkaji Physics
Revision:
Modification (10 marks)
Modification of the Formula 1 car:
Discuss🤗
1. Shape of the car
– streamline shape❌ aerodynamic
– to reduce air resistance ✅
2. Shape of the spoiler
– aerofoil shape (INVERTED AEROFOIL)
– to push the car downwards// increase stability of car ✅
3. Density of the car
– low density ✅
– light//increase acceleration of car ✅
4. Center of the gravity of the car
– lower center of gravity ✅
– more stable ✅
5. Tyre of the car
– tyre with tread ✅
– to increase friction// the car is easy to be stopped when brake is pushed// less slippery ✅
6. Material of the car
– strong material ✅
– durable ✅
7. Safety features for the car
– has seatbelt ✅
– to reduce impulsive force acting on driver when the car is stopped ✅
8. Forward thrust of the car
– greater forward thrust ✅
– to increase acceleration// to travel further in shorter time ✅
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Answering Technique: Section A Paper 2 (No 1, 2, 3, 4 & 5)
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