A luminous object is one that can create its own light, powered by an internal energy source. Luminous objects tend to generate heat due to the light they emit. More »

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Some examples of luminous objects are a burning candle, a light bulb, the sun and other stars, fluorescent materials and tube lights, among other things. Any object is considered luminous if it emits its own light, eithe... More »

The moon and Earth are examples of non-luminous objects. Non-luminous objects become visible only when they reflect light produced by a luminous object. A luminous object, such as the sun, emits its own light, because it... More »

Wien’s law, also known as the displacement law, reveals the wavelength at which any object emits the majority of its energy. The formula used to calculate the wavelengths using Wien’s law is λmax (wavelength) equals 3 x ... More »

www.reference.com Science Physics Optics & Waves

Sound waves occur when an object vibrates and transfers that energy into the air or another medium. When a vibrating object moves forward, it compresses the air molecules in front of it, and when it moves backward, it le... More »

A frame of reference is a method of describing the position, velocity and acceleration of an object. This is usually some type of coordinate system. More »

Because sound is a mechanical wave initiated by an object's vibration, it is propagated by subsequent molecular collisions. Once the colliding air particles hit the eardrum, several internal structures vibrate. These vib... More »