# Heat, Light and Sound

### Description

Sciecece
Mind Map by Pavikshan Siriba, updated more than 1 year ago
 Created by Pavikshan Siriba over 6 years ago
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## Resource summary

Heat, Light and Sound
1. When you heat a substance particles move faster and the substance expands. Whn you cool a substance particles move slower and the substance contracts.
1. Conduction: Heat is passed by a vibration of particles. Convection: Transfer of heat in a liquid or gas due to less dense, warmer matter rising and denser, cooler matter falling (particles). Radiation: Heat movement in electromagnetic waves, which can travel through a vacuum.
1. Radiated heat energy is transferred in a transverse wave (moves at right angles/vertical). Sound waves are transferred as longitudinal waves (move back and forth in the same direction the wave is traveling.
1. Sound travels faster through solids, than liquids and faster through liquids than gasses. Temperature also affects the speed of sound. Sound travels faster through warmer air than through cool air because particles vibrate faster.
1. The number of vibrations a sound makes each second is called the frequency of a wave, which is measured in hertz (Hz). The wavelength of the sound is measured between successive peaks and is measured in meters. Volume is measured by amplitude, greater the amplitude the more energy. Sound travels at 300m/s in air.
1. An object thar releases it own light is called Luminous. A object that doesn't release its own light is called Non-lumnous.
1. According to the law of reflection, the angle of incidence equals (incoming ray) the angle of reflection.
1. When light is reflected off a very smooth surface such as a mirror, it undergoes regular reflection. This produces a clear image, all the rays are reflected in the same direction. Most objects are rough, so they reflect or scatter light in many direction. This is called a diffuse reflection.
1. Refraction is the bending of light as it passes from one substance into another substance. Light refracts because it travels at different speeds in different substances.
1. Total Internal Reflection is when light is completely reflected from the boundary of two substances; it occurs when the angle of incidence is greater than the

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