H.S. Level - SOund And Light Waves

Sound is generated by the vibration of the object and moves by the movement of momentum when the air molecule collides. Our "subjective impression" of sound frequency is called pitch. High vibration frequency is high for high pitch and vibration frequency is low for low pitch. Pure musical tones consist of a single sound or frequency. However, most musical tones are "complex sum" of various pure frequencies, including natural frequencies called fundamental frequencies and a series of overtones or harmonics. Young people can usually hear a pitch of about 20 Hz (very low frequency) to 20,000 (ultrasonic wave).

Warning: For most waves considered in physics, such as acoustic waves and light waves, the wavelength also changes when the frequency is changed. This makes the speed constant. This applies to both sound waves and light waves. The above animation does not mean that sound waves and light waves are displayed. Animation is generally wave, but what does frequency mean? It is intended to indicate that it only occurs when the frequency changes, rather than showing the corresponding change in the wavelength at which the sound waves and light waves are generated.

Like the light waves, the physical properties of sound waves are related to every aspect of our sound perception. The frequency of sound waves is related to our perception of sound pitch. High frequency sound waves are recognized as treble waves and low frequency sound waves are recognized as bass sounds. The frequency of the audible sound is in the range of 20 to 20,000 Hz and has the maximum sensitivity to frequencies falling in the middle of the range. As with the visible spectrum, the audible range of the other species is different. For example, hearing range of chickens is very limited, 125-2000 Hz. The audible range of the mouse is 1000 to 91000 Hz, and the audible range of Berga is 1000 to 123000 Hz. The audible range of our dogs and cats is between 70 - 45 000 Hz and 45 - 64 000 Hz (Strain, 2003).

Examples of wavy phenomena are periodic electrical signals in sonic, light, water waves and conductors. Sonic waves are changes in air pressure, and light and other electromagnetic radiation will change the strength of the electric and magnetic fields. The surface wave is a change in the height of the water. The lattice vibration has different atomic positions. Wavelength is a measure of the distance between iterations of shape features (peaks, valleys, zero crossings, etc.), not a measure of the distance traveled by any particular particle. For example, in a deep-sea sine wave, particles moving near the water surface move in a circle with the same diameter as the wavelength regardless of the wavelength. The wavelength or frequency range of the wave phenomenon is called the spectrum. This name is derived from the visible spectrum, but now it can be applied to the whole spectrum of the electromagnetic spectrum as well as to the acoustic spectrum and the vibration spectrum.