Physics Flashcards
What is sound caused by?
Sound is produced when an object vibrates. As one particle bumps into another particle the vibration is transferred to the next particle.
What is sound?
Vibrations create regions of airsound is caused by vibrations of particles in a wave like motion.
Types of waves in sound:
Longitudinal: A wave in the same direction- moves back and forth.
Define frequency:
Number of waves passing a point per second.
Unit of frequency:
Hertz
High notes =
High frequency and short wave length.
Low pitch=
Low frequency and long wavelengths
What is decibels?
A unit of measure for loudness
Speed of sound:
340 m/s
At sea level
At 20 degrees Celsius
What is wavelength?
Distance between two corresponding parts of waves
What do waves transfer?
Energy
What do waves NOT transfer?
Matter
What is amplitude?
The distance as a particle moves from its position of rest.
Define speed:
As the rate at which an object covers a distance.
Difference between transverse and longitudinal waves?
In a longitudinal wave, the medium moves in the back and worth motion. In a transverse wave will the medium moves perpendicular (up and down) of the wave.
Define refraction:
The bending of light as a result of light speeding up or slowing down.
Define diffraction:
The spreading of waves around obstacles.
Define reflection:
The return of light or sound waves from a surface.
Define ultrasound:
Ultrasound dis sound waves with frequencies higher than the human hearing limit.
What frequencies can humans hear from:
20 Hz to 20000 Hz
What is needed to transfer sound waves?
Medium
What does the reflection of sound produce?
An echo
