Reflection of wave refers to the return of all or part of the waves when they encounter an obstacle
Characteristics of reflected waves:
1. Frequency - same (because same source)
2. Speed - same (because same medium)
3. Wavelength - same (because frequency and speed are constant)
So, what is changed???
Only direction change
Unit Fizik MRSM Merbok
Wednesday, 29 February 2012
1.1 Understanding Waves
Facts about Light Wave
- Light is a transverse wave
- Light slows down, bends toward the normal and has a shorter wavelength when it enters a higher refractive index(n) or as it moves to denser medium..
- Medium with higher refractive index has higher optical density.
- At the critical angle a light wave will be refracted to 90 degrees.
- Blue light has more energy,a shorter wavelength and a higher frequency than red light (remember- ROYGBIV).
- Monochromatic light has one color, frequency & wavelength.
Facts about water waves
- Water waves moves faster at deeper region. This change in speed causes refraction of water waves.
- Water waves has longer wavelength at deeper region.
- Deeper region is less dense than shallow region.
- Water waves bended towards normal as it moves from deeper to shallow region.
- After diffraction, water waves amplitude decrease thus its energy decrease as well.However its speed, wavelength & frequency remain constant.
Facts about sound waves
- Sound is a longitudinal waves.
- Sound is produced through vibration, thus compressing & stretching the surrounding air molecules.
- Louder sound has bigger amplitude.
- Sound with high pitch has higher frequency.
- The sound that we hear is known as 'audio sound' that has freuency between 20-20khz.
- Those sound below 20hz is known as infrasound. While sound with frequency beyond 20khz is known as ultrasonic.
- Sound require medium to travel. It travels fastest in solid> liquid> gas.
- Sound can't be heard in vacuum..Therefore..Starwars' sound effect in outer space is a myth :)
Fizik SPM
Format Fizik SPM
Kertas 1 - 50 soalan objektif
Kertas 2 - 3 seksyen iaitu A (struktur). B (esei) dan C (esei)
Kertas 3 - 2 soalan amali bertulis
Kertas 1 - 50 soalan objektif
Kertas 2 - 3 seksyen iaitu A (struktur). B (esei) dan C (esei)
Kertas 3 - 2 soalan amali bertulis
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