Subparts number 14,15,16,17,18,19,80 B. Write "SOUND" if the statement is TRUE and "BEAT" if the statement isFALSE.11. When an object is forced to vibrate at its natural frequency, resonance occurs.12. Beats occur when two tuning forks at slightly different frequencies are soundedtogether.13. Almost everything that exists has a natural frequency.14. Even steel bridge can collapse because of resonance.15. Interference patterns are produced when two sources of waves are placed side byside.16. Two speakerswhere there is no sound.an be set side-by-side so there are some places in front of them17. The Inversę Square Law states that the intensity of the influence at any givenradius (r) is the source strength divided by the area of phenomena.18. Sounds whose frequencies are below 20 Hz are called ultrasounds.19. Sound intensity level which measures the loudness of a sound perceived byhuman ear is measured in power.20. Harmonic series is neither a series of frequencies of fundamental frequency norintegral multiples of fundamental frequency.

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Answered: Subparts number 14,15,16

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