# Heat, Light and Sound - 1.1: Heat

### Description

9 Science Flashcards on Heat, Light and Sound - 1.1: Heat, created by Omar Allan on 07/25/2016.
Flashcards by Omar Allan, updated more than 1 year ago
 Created by Omar Allan almost 8 years ago
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## Resource summary

 Question Answer What is heat? Heat is a form of energy and describes the total energy of all particles within an object. What is temperature? Temperature indicates how hot or how cold something is. How is temperature measured? Temperature is measured with a thermometer which gives an accurate measurement of temperature. What are three different scales of temperature used. Fahrenheit, Celsius and Kelvin. What is heat transfer? Heat transfer is when heat flows from an area of high temperature to an area of low temperature. What are three ways of heat transfer? Conduction, convection and radiation. What is conduction? Conduction is when vibration of particles of a hotter substances start vibrating a colder substance, making it hotter in the process. What is convection? Convection is when air is heated to rise and expands out but than cools causing it to sink and flow back to the source of heat. What is radiation? Radiation is heat transmitted through waves travelling at the speed of light. All objects emit some infra-red radiation. What happens when radiation hits a surface? Depending on what the surface is made of and what colour, the radiation has a possibility of being absorbed by the surface. What is sound? Sound is produced when something vibrate. When something vibrates, it passes through its surrounding environment, such as air. What is compression? Compression is the region of space in which air particles are bunched together. What is rarefaction? Rare faction is the region of space in which air particles are spread out. What are the different types of sound waves? The different waves are the transverse wave that moves horizontally while its particles are moving vertically, and longitudinal waves where particles move back and forth. What is the speed of sound? The speed of sound is the amount of time it takes sound to travel. The more closely packed the particles are in its environment, the faster the sound is. What is an echo? Sound is able to transmit itself through thin objects. Hard surfaces however reflect sound waves which causes an echo. What materials absorbs sound? Soft materials such as curtain fabric, carpet and cushions absorb sound to produce heat. What is frequency and pitch? Frequency and pitch is the measurement of the number of vibrations a sound makes. How is frequency measured? Frequency is measured in hertz (Hz). What range of frequencies can we hear? As people age their ability to hear high frequencies are reduced. Young people are able to hear up to 20,000 Hz, while most people over 65 can only hear above 5000 Hz.

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