SOUND
What is sound?
Sound travels in waves made by vibrating objects. If an object vibrates with enough energy we can hear a sound.
PROPERTIES OF SOUND.
Frequency: It depends how fast or slow a sound wave moves. It is measured in hertz.
Intensity: It is the loudness of a sound. It is measured in decibels
Loudness: The amplitude of a sound wave determines its loudness or volume.
Pitch: The frequency of a sound wave is what your ear understands as pitch
LIGHT.
HOW LIGHT TRAVELS?
Light travels in differen directions such as in a straight line or in any direction.
Reflection: occurs when light bounces off objects. If the surface is rough, the light scatters. If the surface is smooth and flat, the light will bounce off it at equal angles.
Refraction: Is the change in direction of the rays when they pass through a transparent material.