B. Decode the hidden word by choosing the right letter on the box below. (5 pts) Follow the color and letter given, echo decibels noise quality pitch sound waves intensity vibrations W D G E K o N e produced by the vibration of matter back and forth movement of molecules pattern of sound reflected sound loudness and softness of sound highness and lowness of sound units of sound irregular vibrations depends on the nature of sounds
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ANSWER
1. K
2. N
3. O
4. W
5. L
6. E
7. D
8. G
9. E
EXPLANATION
1. Sound is a form of energy produced and transmitted by vibrating matter (a solid, liquid, or gas). The source of all sound is movement.
2. The back and forth motion of the object is called vibration or oscillation.
3. When molecules in a medium vibrate, they can move back and forth or up and down.
4. In audio signal processing and acoustics, an echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener.
5. Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2).
6. Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them. A high frequency (e.g., 880 hertz [Hz; cycles per second]) is perceived as a high pitch and a low frequency (e.g., 55 Hz) as a low pitch.
7. The decibel scale is logarithmic, which means that loudness is not directly proportional to sound intensity. Instead, the intensity of a sound grows very fast. This means that a sound at 20 dB is 10 times more intense than a sound at 10 dB.
8. Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound.
9. Sound quality is typically an assessment of the accuracy, fidelity, or intelligibility of audio output from an electronic device.