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Grade 12th pass8 grade science

What is a sonogram ? Why is it preferred to X-rays ?

Harshit Singh

5 Years agoGrade 12th pass

1 Answer

Pawan Prajapati

5 Years ago

Sonogram is image of the internal organs. Ultrasound can pass through the human body and are reflected back. The reflections are recorded by computer and images are generated on the screen. Sonogram is not harmful and is therefore used for studying the foetus or stone or tumor in the organs. On the other hand, X-rays can be harmful if humans are exposed for longer time.

I want complete notes on the chapter friction
In my book subtopics are:
Friction
Types of friction
Factors affecting friction
Methods of reducing friction
Methods of increasing friction
Advantages and disadvantages of friction
Some real life based situation where friction is applied.

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