SSC English Version
Physics Chapter 7 (Waves and Sound)
Wave: The periodic motion of particles that transfers energy from one place to another through a material medium but does not displace the particles permanently is called wave.
Amplitude: The maximum displacement of a wave-transmitting particle from the equilibrium position is called amplitude.
Wave Velocity: The distance that a wave travels in one second in a particular direction is called wave velocity.
Frequency: The number of complete vibrations in one second of a wave transmitting particle is called frequency. The unit of frequency is Hz (s-1).
Phase: The overall condition of motion of a wave-transmitting particle at any moment is called phase.
Range of Audibility: The frequency range we can hear is 20 Hz – 20,000 Hz which is called the range of audibility.
The sound having frequency less than 20 Hz is called infrasonic sound and greater than 20000 Hz is called ultrasound.
Echo: When a sound becomes separated from its original sound and is repeated due to reflection. This reflected sound is called an echo.
Persistence period of hearing: The persistence period of hearing is 0.1s.
Periodic Motion: If the motion of a moving particle is such that it passes through a definite point along the path of its motion in the same direction in a definite interval of time, this type of motion is called periodic motion.
Harmonic Motion: If a body executing periodic motion moves in a definite direction for one half of its time period and exactly for the other half in the opposite direction, then this motion is called oscillatory or harmonic motion.
Musical Sound: The sound which creates the sensation of sweetness in our ear is called musical sound.
Intensity of Sound: The amount of energy flowing per second per unit area perpendicular to the direction of the propagation of the sound.
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