Waves and Sound

Waves and Sound

1. periodic motion:motion repeated in equal intervals of time.

2. Periodic motion:motion repeated in equal intervals of time.

3. Doppler effect: is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

4. hearing: Hearing is the sense that allows you to distinguish sounds with your ears. Dogs have a particularly acute sense of hearing, and they can hear sounds pitched too high for humans to hear.

5. refraction: the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different. Ophthalmology.

6. Interference: the process in which two or more light, sound, or electromagnetic waves of the same frequency combine to reinforce or cancel each other, the amplitude of the resulting wave being equal to the sum of the amplitudes of the combining waves.

7. Sound: the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium.

8. Frequency :the number of waves that pass a fixed point in unit time.

9. Resonance: The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

10. Strings: is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.

11. Reflection: is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

12. Beats: is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies.

13. Decibels: the scale for measuring intensity is the decibel scale.

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