Flashcards
4.2 Sound
Cards in this deck (20)
- 1How is sound produced?Sound is produced when something vibrates, moving back and forth very quickly.
- 2What are the bunched up areas called?Compressions
- 3What are the spaced out areas called?rarefactions
- 4What is the vibrating source for speech?The vocal cords
- 5What is the vibrating source for a drum?The drum skin
- 6What is the vibrating source for a piano?The string inside the piano
- 7What is the vibrating source of a saxophone?The reed inside the mouthpiece and therefore the air inside the saxophone
- 8What is the vibrating source of a car stereo system?The speaker cone
- 9What is the vibrating source of a bell ringing?The metal casing of the bell
- 10Define sound wave.a wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
- 11Define frequency.the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.
- 12What is a transverse wave?a wave in which the medium vibrates at right angles to the direction of its movement.
- 13What is the unit used to measure frequency?Frequency is measured in Hertz (Hz)
- 14What is the unit used to measure wavelength?metres (m)
- 15Young people can typically hear a range of frequencies up to....20, 000 Hz
- 16Most people over 65 years cannot hear frequencies above...5000 Hz
- 17(T/F) A sound wave can travel into a vacuum (e.g.space)?Sound can't travel through a vacuum because there is no matter for the vibrations to work in.
- 18What is meant by the term reverberation?Length of time the sound can be heard.
- 19Why do echos occur?An echo occurs when a sound wave reflects back towards its source after hitting a hard surface.
- 20What is an ultrasound?Sound waves with frequencies higher than the upper audible limit of human hearing.
Information
- Description
- Flashcards on 4.2 Sound, created by Rubah Albadri on 27/07/2019.
- Created by
- Rubah Albadri
- Views
- 5
- Rating