Things u should know about waves..
- Waves transfer energy without transfering the matter.
- In transverse waves, its particles vibrate perpendicular to the wave direction.
- Longitudinal wave's particles vibrate parallel to the wave direction.
- The amplitude of a wave determines its energy. Higher amplitude has greater energy.
- Damping of wave causes decrease in amplitude & energy.
- Waves' wavefront is always pependicular to the direction of the waves.
- Waves undergo all of these phenomena; reflection, refraction, diffraction & interference.
- Water,light & electromagnetic waves are transverse waves.
- Coherent waves have same frequency ,amplitude and in phase.
- As the frequency of a wave increases its energy increases and its wavelength decreases.
- Shorter waves with higher frequencies have shorter periods.
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 :)
