Sound Part One + Super Imposing Flashcards
What is a wave?
A wave is a transfer of energy, not matter, between stores
There are two types of waves: longitudinal and transverse; which does sound fall under?
Longitudinal
How is a sound wave created?
Vibrating of particles. The vibration of some particles will cause the ones behind and in front of it to move back and forth. This crates compressions and rarefactions
For a sound wave? Which direction so the particles move in relation to movement.
They’ll move in the same direction as enters travel in a longitudinal wave is parallel to the direction of particle movement.
Sound waves refract and reflect. Explain further (how do they reflect and refract)
Sound waves will reflect if they hit a hard, flat surface. They’ll refract if they enter a different media. As they enter a denser material they’ll speed up
How does sound speed up and slow down as it travels into a denser material? List two explanations.
Sound waves travel particle by particle, and a denser material has closer packed particles meaning more collisions would happen and quicker energy transfer will happen. And for a less dense material it’s the opposite
As well as this, when a wave travels in a different medium, it’s wavelength will change, but it’s frequency won’t, so the speed must change to compensate for this
What is echo?
Sound reflecting on a hard flat surface. Sound will hit and reflect back which is what you hear in an echo
What is a vacuum in physics l?
A vacuum has no matter and the pressure is so low there that the particles there do no effect. E.g. space is a vacuum
Why can’t sound travel through a vacuum?
Because sound travels by particles, and if particles have no effect in a vacuum, sound can’t travel.
Sound waves travel at different speed through different states of matter; explain.
Sound travels the fastest across solid as the particles are closer together and sound/energy can be passed on/transfer quicker. Sound travels the slowest through gas
How do we calculate speed and what do we do if it’s an echo?
Speed = distance/time and half the answer by two if it’s echo or ultrasound
Explain how two cups connected by a string work so people can hear when using them?
Person speaks, producing sound wave that vibrates through the air causing particles to move back and forth Anne the sound travels to base of the pot.
It then hits the base and air particles that hit the base cause it to vibrate which causes the string to do the same and transmit the vibrations and we repeat for the other cup.
What is superimposing?
When waves combine (superimpose) with each other to form one big wave
How does superimposing work?
Two crests combine to form a super crest and two peaks combine to form a super peak and a crest and a trough will cancel out to make nothing. So we have one big wave
