CBSE Class 9 Answered
we can hear ultrasonic sound but cannot understand it ?
Is it true or false.
explain it.
Asked by ranjitrk1 | 29 Jan, 2016, 07:21: PM
Expert Answer
The sounds having too high frequency (i.e., greater than 20,000 Hz) which cannot be heard by human beings are called ultrasonic sound or ultrasound. Due to its very high frequency, ultrasound has a much greater penetrating power than ordinary sound. So, it is used to detect objects under the sea and organs inside the human body. They are able to travel along well-defined paths even in the presence of obstacles. Ultrasound techniques are used extensively in industries and for medical purposes.
- Ultrasound is generally used to clean parts located in hard-to-reach places. Objects to be cleaned are placed in a cleaning solution, and ultrasonic waves are sent into the solution. Due to the high frequency, the particles of dust, grease and dirt get detached and drop out. The objects thus get thoroughly cleaned.
- Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components are generally used in the construction of big structures such as buildings, bridges, machines as well as in scientific equipment. The cracks or holes inside the metal blocks, which are invisible from outside, reduce the strength of the structure. Ultrasonic waves are allowed to pass through the metal block, and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back, indicating the presence of the flaw or defect.
- Ultrasonic waves are made to reflect from various parts of the heart and form the image of the heart. This technique is called echocardiography.
- Ultrasound can be used to break stones in the kidneys into fine grains.
Answered by Faiza Lambe | 30 Jan, 2016, 09:18: AM
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