P3.4 - Sound Flashcards
What is sound wave? [1]
A longitudinal wave that transfers energy through vibration of particles.
What can sound waves be described by? [3]
- frequency
- wavelength
- amplitude
What does a high amplitude lead to, in terms of sound? [1]
Louder sound
What does a high frequency lead to, in terms of sound? [1]
Higher pitched sound
What does sound travel at, in air? [1]
330m/s
What does speed =? [1]
distance/time
How do you find the distance from the source to the reflector in metres? [2]
330 x the time taken (number of seconds)
What type of medium does sound travel the fastest in? [1]
Solids
What type of medium does sound travel the slowest in? [1]
Gases
When does sound travel faster? [1]
The denser the material
Does light travel faster or slower in denser materials? [1]
Slower
Why does sound travel faster in denser material? [3]
- particles are closer together
- particles can collide with the next particle quicker
- particles can more efficiently transfer the energy
What is the range of frequencies audible to humans? [2]
20Hz to 20kHz
What is ultrasound? [1]
Sound with a frequency
higher than 20kHz
What is an echo? [1]
The reflection of a sound wave
