Sound waves Flashcards
Sound
What is sound?
Sound is a vibration that travels through air, water, or solids and can be heard when it reaches a person’s or animal’s ear.
True or False: Sound can travel through a vacuum.
False
Fill in the blank: The unit of frequency is called _____
Hertz
What is the range of human hearing in Hertz?
20 Hz to 20,000 Hz
Which of the following is a characteristic of sound: a) Amplitude b) Color c) Density?
a) Amplitude
What is amplitude?
Amplitude is the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
True or False: Higher amplitude means louder sound.
True
What does pitch refer to in sound?
Pitch refers to how high or low a sound is perceived to be.
Fill in the blank: The speed of sound is faster in _____ than in air.
water
What is the term for the reflection of sound?
Echo
Which instrument is used to measure sound intensity?
Sound level meter
True or False: Sound travels faster in solids than in liquids.
True
What is a sound wave?
A sound wave is a longitudinal wave that consists of compressions and rarefactions.
Fill in the blank: The frequency of a sound wave determines its _____
pitch
What is the Doppler effect?
The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.
What is resonance?
Resonance is the phenomenon that occurs when an object vibrates at its natural frequency due to external vibrations.
True or False: Sound cannot be reflected.
False
What is the difference between noise and music?
Noise is an unwanted or unpleasant sound, while music is a structured sound that is often harmonious and pleasing to listen to.
Fill in the blank: The _____ of a sound wave determines its loudness.
amplitude
What is a decibel?
A decibel is a unit used to measure the intensity of sound.
What is the term for the lowest frequency of a sound wave that can be produced?
Fundamental frequency
True or False: Sound waves can travel through liquids.
True
What is the term for the bending of sound waves around obstacles?
Diffraction
Fill in the blank: The phenomenon of sound being absorbed by materials is called _____
absorption
What is a sound barrier?
A sound barrier is the point at which an object moves faster than the speed of sound.
True or False: All sounds require a medium to travel through.
True
