Sound

How do bones help me hear

Sound:

  • Sound is a very important part of our lives.
  • Sound is basically the energy made up of vibrations caused by any object or medium.
  • To and fro motion of any object is termed as vibration.
  • The greater is the amplitude the more is the vibration and the louder is the sound.
  • When we speak our vocal cords or larynx  vibrate to produce a sound.
  • Two vocal cords are stretched across the voice box or larynx in a way that it leaves a narrow slit between them for the passage of air.
  • Then the lungs force air through the slit, and the vocal cords vibrate producing a sound.
  • Men have larger vocal cords then women,
  • Whereas children have a very short vocal cord.
  • That is why all of them have different voices.

Does Sound Needs A Medium To Travel?

  • Yes, the sound needs a medium to travel.
  • Sound cannot travel through Vacuum.
  • Sound can travel through solid, liquid and gas.
  • We are able to hear the sound with the help of our ears.
  • The outer part of our ear collects the sound.
  • Then the sound travels down a canal.
  • At the end of the canal there is a thin stretched membrane which is called the eardrum.
  • Sound vibrations makes the eardrum vibrate.
  • And then the eardrum send those vibrations to the inner ear.
  • The vibrations from the inner ear is received by our  brain.
  • That’s how we are able to hear.
  •  Our eardrum is very important to us.
  • If the eardrum gets damaged we may become deaf.

What is an Amplitude:

  • The maximum extent of a vibration or oscillation measured from the position of equilibrium is known as amplitude.
  • It measures how loud or soft a sound is.

What is Frequency?

  • The number of oscillations per second is termed as frequency .
  • The symbol of frequency is hertz (Hz).
  • Amplitude and Frequency are two important properties of any sound.
  • We can differentiate between sounds with the help of it’s amplitude and frequency.

What is Time Period?

  • The time taken by a pendulum to complete one oscillation is it’s Time Period.
  • The unit of Time Period is Seconds (s).
  • Frequency and Time Period are inversely proportional to each other.
  • As frequency increases , the time period decreases.

Loudness Of A Sound?

  • Loudness of a sound is proportional to the square of the amplitude of the vibration producing the sound.
  • The loudness of a sound depends on it’s amplitude.
  • If the amplitude is large, the sound produced is loud and vice-versa.

Pitch Of A Sound?

  • The loudness and the softness of a sound is called Pitch of a sound.
  • If the frequency of a vibration is higher, the pitch produced is loud.
  • If the frequency of a vibration is lower , the pitch produced is low.

Audible and Inaudible Sound:

  • The vibration of a sound which is in between 20HZ AND 20,000hZ is an audible sound.
  • The vibration lower then 20Hz cannot be detected by human ear so it is termed as Inaudible Sound.
  • Dogs can hear a sound above 20,000Hz.

What is Noise?

  • Unpleasant sound which a human ear can’t tolerate is considered as Noise.

Noise Pollution:

  • Presence of excessive and unwanted sound  in our environment is called Noise Pollution.
  • Major causes of Noise Pollution are horns of Vehicles, burning of crackers, loudspeakers etc..
  • Presence of excessive noise in our surrounding is bad for our health
  • As it causes headaches , High blood pressure, irregular sleep patterns etc..
  • A person can also have temporary or permanent impairment of hearing if exposed to loud sound.

How We Can Control Noise Pollution:

  • Silencing devices should be installed in vehicles .
  • Factories or various industries should be build up away from residential areas.
  • TV or speakers should be at at low volume by which others don’t get disturbed.
  • We should plant as many trees as we can to reduce the power of the sound.
  • We should cover our windows through curtains or shut the door to minimise the effect of sound.

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