The Sound and Usefullness

Sound can interpreted as something audible year and result from an object vibration. This sound source vibration jars air invinicity and can creep to all direction as longitudinal wave. Then from human ear can hear sound either sound coming by from object around us or utterance which is written and can be read.

Human ear consists of exclave that is auricle, mesotic and inner ear (consists of coclea and cranial nerve). Sound entering by tour ear will be transferred by to our brain to process signal and can differentiate sound. Ear will experience damage caused by some factor namely factor age, damage of cochlea stringet sound (for example hard music in room or factory clunk), factor often listens songs by using headset (volume stringent song voice), and factor of the happening of infection at ear. Therefore the factory workers often uses ear protector that ear not happened damage.

Human early generally can only hear sound owning by frequency 20 Hertz - 20.000 Hertz. While sound owning by higher frequency out of 20.000 Hertz is named by ultrasonic and only some animals owning by frequency more than 20.000 Hertz its example of dog can hear sound to 25.000 Hertz, cat hear sound with frequency to 65.000 Hertz and porpoise can hear sound up to frequency to 150.000 Hertz. We as God's creation creature most by perfect must thank goodness because we can only hear sound who which the frequency reaches by limited: 20 Hertz - 20.000 Hertz. If we can hear sound which the frequency reaches by more than 20.000worl Hertz becomes like fun. Have no silence where - which.

Human also sensitive at frequency 3.000-4.000 Hertz. Higher frequency out of 20.000 Hertz is named by ultrasonic. ultra sonic earns useful also for every day life of the example of ultrasonic can detect burst at metallic structure or concrete and clean object like diamond and machine parts. Like the one have we known that diamond and or very machine parts difficult to clean. Many men have not known waving ultrasonic can clean dirt patching by at diamond or machine parts. Having diamond and or machine parts which will be by cleaned plunged into dilution. Then this dilution is flown with ultrasonic wave, so that can cause dilution vibrate considerably strong. This dilution vibration then molts dirt of the diamond and or machine parts. We not necessarily use harsh slpon or hard detergent.

Written by : Marsita Madusila