Chapter 1- Sound Flashcards
What is sound?
What we hear when sound waves pass through a medium to the ear. Sound is a type of energy made my vibrations.
What are vibrations in the air called?
The vibrations are called travelling longitudinal waves.
What is a transverse wave?
A wave formed because the oscillation is perpendicular to the disturbance.
What is a longitudinal wave?
Formed because the oscillation is parallel to the disturbance
What is the elevation called?
Crest
What is the depression called?
Trough
What are the characteristics of a sound wave?
Wavelength- length between 2 consecutive peaks
Amplitude- height of wave
Frequency- number of sound waves per second
Time period- time taken to produce 1 complete wave
Speed
What is velocity?
The distance covered by a sound wabe
What is the relationship between frequency, wavelength and velocity?
F=V x W
What are the conditions necessary to produce sound?
- Vibrating body
- Receiver
- Medium to travel
What are the characteristics of sound?
Loudness: degree of sensation of sound
Quality: distinguish between 2 different sounds of the same pitch and loudness
Pitch: shrillness or deepness of sound
Intensity: number of sound waves passing through 1 metre square in a second
What is reflection of sound?
Bouncing back of sound wave from a surface of a solid or a liquid. Polished or rough and big obstacle is needed.
What is an echo (echo of sound)?
Sound we hear after reflection. Repetition of multiple reflections of sound waves.
How does a bat use ultrasound?
Bats catch their prey by producing ultrasound. They then detect the reflected sound waves coming from the obstacle. By detecting the reflection of sound, they understand the position and the type of prey or any obstacle in the way.
What are other uses of ultrasound?
- Detection of blockade in pipes
- Detection of deformities in metal blocks
- Cleaning machinery parts beyond reach
- Detection of ailments in the human body
