1) Introduction 2) Characteristics of Sound 3) Doppler Effect 4) Quality of Sound 5) Music Nilai University

1. SOUND
BY: GROUP LOUSY
• Dhass
• Dixon
• Chris
• Nic

2. CONTENT
• Introduction
• Characteristics of Sound
• Doppler Effect
• Quality of Sound
• Music

4. INTRODUCTION
 In physics, sound is a vibration that propagates as a typically audible
mechanical wave of pressure and displacement, through a medium such as
air or water (longitudinal wave).

6. CHARACTERISTICS OF SOUND
 Sound waves have frequency; that is, the pitch of sounds goes up or down.
The SI unit of frequency is called a Hertz, often written as Hz.
 The amplitude of a sound determines its volume (loudness).
 Tone is a measure of the quality of a sound wave.
 Sound travels the fastest in solid, second in liquid, slowest in gas.
 The speed of sound in air is 343.2m/s

7. • Frequency is dependent on wavelength and the speed of sound. It is
calculated with the following equation:

9. DOPPLER EFFECT
 The Doppler Effect is the change in frequency of a wave for an observer
moving relative to its source.
 It is named after the Austrian physicist Christian Doppler, who proposed it in
1842 in Prague, Czech.
 When the source of the waves is moving toward the observer, each
successive wave crest is emitted from a position closer to the observer than
the previous wave. Therefore, each wave takes slightly less time to reach the
observer than the previous wave. Hence, the time between the arrivals of
successive wave crests at the observer is reduced, causing an increase in the
frequency.

12. QUALITY OF SOUND
 In physics, timbre, also known as sound quality, is the quality of a musical
note, sound, or tone that distinguishes different types of sound production,
such as voices and musical instruments, string instruments, wind
instruments, and percussion instruments.
 Timbre is what makes a particular musical sound different from another,
even when they have the same pitch and loudness.

13. MUSIC
•Different frequencies create different sounds, high frequencies
soundvery ‘sharp’ while low frequencies sound very ‘heavy’.
•This is the reason to why we have music equalizers, so we can hear
various frequencies at the same time.

14. ANY QUESTIONS??