AUDIBLE, INFRASONIC AND ULTRASONIC WAVES
Sound of Class 9
AUDIBLE RANGE:
The human ear is sensitive to sound waves of frequency between 20Hz to 20 kHz. This range is known as audible range.
e.g. By vibrating sitar, guitar, organ pipes, flutes, shehnai etc.
INFRASONIC WAVE:
A longitudinal elastic wave whose frequency is below the audible range i.e. 20 Hz, is called an infrasonic wave.
it is generally generated by a large source.
e.g. : Earthquake.
- SOUND NEEDS A MATERIAL MEDIUM FOR ITS PROPAGATION
- SONIC BOOM
- Introduction sound
- THE HUMAN EAR
- NATURE OF SOUND
- PRODUCTION OF SOUND WAVES
- PROPAGATION OF SOUND
- CHARACTERISTICS OF SOUND
- RANGE OF HEARING
- REFLECTION OF SOUND
- SPEED OF SOUND IN DIFFERENT MEDIUM
- EFFECT OF TEMPERATURE ON THE SPEED OF SOUND
- RELATION BETWEEN SPEED OF SOUND, TIME OF HERING ECHO-AND DISTANCE OF REFLECTING BODY
- AUDIBLE, INFRASONIC AND ULTRASONIC WAVES
- ULTRASOUND
- SONAR
- REASON FOR USING ULTRASONIC WAVES IN SONAR
- Solved questions
- Exercise 1
- Exercise 2
- Exercise 3
- Exercise 4 (Fill in the blanks)
- Exercise 5 (Subjective)
- Mind Map
