Categories
Assistant General Science

Physics – 06

ഭൗതികശാസ്ത്രത്തിലേക്ക് തിരികെ വരുമ്പോൾ ശബ്ദവുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ.

  • Study of Sound

Acoustics

 

  • Sound waves cant travel through

Vacuum

 

  • Sound waves are

Longitudinal

 

  • Sound travels faster in

Solids

 

  • Sound travels slower in

Gases

 

  • Solid medium in which speed of Sound is maximum

Steel

 

  • Hearing capacity of human

20 to 20,000 Hz

 

  • Speed of Sound in air

340 m\s

 

  • Speed of Sound in water

1453 m\s

 

  • As the density of medium increases, speed of Sound

Increases

 

  • As the temperature of medium increases, speed of Sound

Increases

 

  • Properties of Sound

Pitch, Loudness, Timbre (Quality)

 

  • Shrillness of Sound is known as

Pitch

 

  • Intensity of Sound is identified as

Loudness

 

  • Unit of frequency of Sound

Hertz (Hz)

 

  • Unit of Intensity of Sound

Decibel (db)

 

  • Unit of Sound Pollution

Decibel

 

  • Normal unit of measuring Pollution

Parts per million (ppm)

 

  • Normal Sound level

60-120 db

 

  • Intensity of human sound

60-65 db

 

  • Sound level causing damage to human ears

Above120 db

 

  • Sound allowed in hospital areas at night

About 40 db

 

  • Sound allowed in residential areas

50 db in day 40 db at night

 

  • Organ in human beings which helps to produce Sound

Larynx

 

  • Sound is produced due to

Vibration

 

  • Phenomenon of sound to obstructed by a hard surface and send back to source is called

Reflection of Sound

 

  • Echo and Reverberation are due to

Reflection of sound

 

  • A vibrating system or external force drives another system to oscilate with greater amplitude at a specific freaquency is known as

Resonance

 

  • Persistence of sound as a result of multiple reflection is known as

Reverberation

 

  • Phenomenon of hearing a sound reflection after hearing the original sound is

Echo

 

  • Minimum sound required for the production of Echo

17 Meter

 

  • Phenomenon of sound which used in Stethoscope

Reflection of sound

 

  • Phenomenon of sound which used in SONAR

Echolocation

 

  • Sound waves used in SONAR

Ultrasonic Sound

 

  • SONAR stands for

Echolocation

 

  • Devices used to measure the depth of the sea

Echo Sounder (SONAR), Fathometer

 

  • Unit of measuring the depth of the sea

Fathom (1 Fathom= 6 Feet=1.82 metre)

 

  • Devices used to get the picture of the objects at the bottom of the sea

SONAR

 

  • Whistle used for calling dogs

Galton whistle

 

  • Devices used in the studies of sound

Sonometer

 

  • Device used for recording sound under water

Hydrophone

 

  • Term used to denote the speed lower than the speed of sound

Subsonic

 

  • Term used to denote 2 times the speed of sound

Supersonic

 

  • Term used to denote 5 times the speed of sound

Hypersonic

 

  • Sound waves produced by Elephants and Whales for communication

Infrasonic

 

  • Sound waves produced by Bats and Dolphin

Ultrasonic

 

  • Sound waves used in Ultrasound scanning

Ultrasonic

 

  • Sound lower than 20 Hz

Infrasonic

 

  • Sound higher than 20,000 Hz

Ultrasonic


(To be Continued…)