A trough is the low point of a wave., A photon is a particle of light; a tiny bundle of energy, Electromagnetic waves transfer energy through empty space., Rays are straight lines that show the direction of light., Crests are the high points of transverse waves., Refraction is when light passes through a medium., Mechanical waves transfer energy through matter., Reflection is when light bounces off a medium., Amplitude is the height of a transverse wave., Echoes are caused by reflected sound waves., Wave speed is the distance a wave travels per unit of time., Waves are disturbances that transfer energy., Frequency means the number of complete waves passing a point in a given time., Longitudinal waves cause the particles of a medium to move back and forth., Oscillation means moving back and forth at a regular speed., When light disappears in a medium and is converted to another form of energy it has been absorbed., We measure wave frequency in hertz., A medium is any matter that mechanical waves can travel through., Light is a form of electromagnetic energy., Light is made up of streams of photons., Transverse waves vibrate at right angles.

Light & Waves

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