While a luminous flame burns yellow, a non-luminous flame burns blue; this is because of the difference in available levels of oxygen. Luminous flames have limited access to oxygen, while non-luminous flames have unlimit... More »

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 key difference between infrasonic and ultrasonic waves is that infrasonic waves include sounds emitted at levels below frequencies of noise that can be heard by humans while ultrasonic waves are those that exceed 20 ... More »

The difference between 50Hz and 60Hz means that a cycle of power is different by approximately 0.0033 seconds. In many parts of Europe, power is delivered at a frequency of 50Hz, whereas in the United States 60Hz is the ... More »

www.reference.com Science Physics Optics & Waves

In addition to the role it plays in driving the water cycle and affecting climate and weather, the energy received from the sun also makes possible the process of photosynthesis, which maintains the atmospheric levels of... More »

www.reference.com Science Physics Optics & Waves

The difference between a long and short wavelength is the distance between two identical points on successive waves. Wavelength is also characteristic of the energy level of a particular wave, with shorter wavelengths be... More »