10 Questions
What is the primary factor that determines the pitch of a sound?
The frequency of the sound wave
What happens to the amplitude of a sound wave when its frequency increases?
It decreases inversely
What is the characteristic of a sound that is perceived as loud or soft?
Loudness
Which of the following best describes the relationship between the frequency and time period of a sound wave?
They are inversely proportional
What is the minimum distance required for an echo to be heard clearly?
17 meters
What happens to sound waves when they meet a soft surface?
They are absorbed
What is the characteristic of a sound wave that determines its pitch?
Frequency
What is the type of sound wave that is repeated because of reflection?
Echo
What is the relationship between the amplitude and loudness of a sound wave?
They are directly proportional
What is the term for the intensity of a sound wave?
Intensity
Study Notes
Waves
- A wave is a disturbance that travels through a medium, transporting energy from one place to another without transporting matter.
Types of Waves
- Mechanical waves: require a medium to travel, e.g. water waves, sound waves
- Electromagnetic waves: do not require a medium, e.g. light waves
Characteristics of Waves
- Wavelength (λ): distance between two consecutive points on a wave that are in phase
- Frequency (f): number of oscillations or cycles per second
- Time period (T): time taken to complete one oscillation or cycle
Relationship between Frequency, Wavelength, and Time Period
- Wavelength is inversely proportional to frequency (λ ∝ 1/f)
- Frequency is inversely proportional to time period (f = 1/T)
Characteristics of Sound
- Pitch: characteristic of sound that allows us to distinguish between shrill and grave sounds
- Loudness: determined by the intensity of sound waves
- Amplitude: increases as frequency decreases, and decreases as frequency increases
Sound Waves
- Longitudinal wave: particles oscillate back and forth along the direction of the wave
- Produced by vibrations, e.g. drumbeat, voice
- Pitch increases with increase in frequency of vibration
Echo
- Sound that is repeated because sound waves are reflected back
- Occurs when sound waves bounce off smooth, hard objects
- Echo is heard clearly when the reflecting surface is at least 17 meters away
Learn about the basic terms related to sound waves, including compression and rarefaction, and how they move through the air as a series of alternate high and low-pressure zones.
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