# data[].attributes.body
The Doppler effect is the change in frequency of a wave caused by the movement of the source, detector, or both.

# data[].attributes.body
a decibel is the unit of measuring sound

# data[].attributes.body
The EM Spectrum (electromagnetic) is the range of waves that include radio waves, light waves, and x-rays. There are also gamma rays, infrared rays, and ultraviolet waves present on the spectrum.

# data[].attributes.body
Light can also be refracted which occurs when the light rays bend as as they cross between 2 different substances (i.e. pencil in water)

# data[].attributes.body
Light can be reflected which occurs when the light rays bounce off of the surface they meet.

# data[].attributes.body
When you mix the 3 primary colors of light (green, blue, and red) you get white light. This occurs because "mixing" light is a subtractive process.

# data[].attributes.body
Sound also travels faster through solid materials such as wood and steel opposed to travelling through gases such as air.

# data[].attributes.body
Sound is a longitudinal wave