05-01-2018, 04:35 PM
SOUND
* Study of Sound
Ans: Acoustics
*Sound waves can’t travel through
Ans : Vacuum
*Sound is a longitudinal wave
*A medium is necessary for sound to travel
Sound travels faster in
Ans : Solids
*Sound travels slower in
Ans : Gases
*Solid medium in which speed of sound is greater
Ans : Steel
*Hearing capacity of human-20 to 20,000 Hz Speed of sound in air
Ans : 340 m/s
*Speed of sound in water
Ans : 1453 m/s
*As the density of medium increases speed of sound
Ans : Increases
*As the temperature of the medium increases speed of sound
Ans : Increases
*Properties of sound
Ans : Pitch, Loudness, Timbre (Quality)
*Shrillness of sound is called as
Ans : Pitch
*Intensity of sound is identified by
Ans : Loudness
*Unit of frequency of sound
Ans : Hertz (Hz)
*Unit of intensity of Sound
Ans : Decibel (db)
*The unit which is usually used to denote the intensity of pollution
Ans : Parts Per Million
*Unit of measuring sound pollution
Ans : Decibel
*Normal sound level in decibel
Ans : 60 -120db
*Intensity of human sound
Ans : 60-65 db
*Sound causing damage to hearing
Ans : above 120 db
*Sound allowed in hospital areas in night
Ans : about 40 db
*Sound allowed in residential areas
Ans : 50 db (day), 40db (night)
*Organ in human beings which helps to produce sound
Ans : Larynx
*Sound is produced due to
Ans : Vibration
* When sound waves are obstructed by a hard surface it is sent back to the sound source. This phenomenon is called
Ans : Reflection of Sound
*Echo and Reverberation are due to
Ans : Reflection of sound
*The phenomenon that occurs where a vibrating system or external force drives another system to oscillate with greater amplitude at a specific preferential frequency
Ans : Resonance
Sounds
*Term used to denote the speed lower than the speed of sound
Ans : Subsonic
* Term used to denote 2 times the speed of Sound
Ans : Supersonic
*Term used to denote 5 times the speed of Sound
Ans : Hypersonic
*Sound waves produced by Elephants and Whales for Communication
Ans : Infrasonic
*Sound waves produced by Bat, Dolphin etc
Ans : Ultrasonic
*Sound waves used in Ultrasound Scanning
Ans : Ultrasonic sound
*Audible Sound (20 Hertz to 20,000 Hertz)
Ans : Sonic sound
*Sound lower than 20 Hz
Ans : Infrasonic sound
*Sound higher than 20,000 Hz
Ans : Ultrasonic sound
