Grade 12th pass8 grade science
What are ultrasounds ? How are they useful to us?
What are ultrasounds ? How are they useful to us?
1 Answer
Pawan Prajapati
Sound having frequency higher than 20kHz is known as ultrasound, is used for
detecting finer faults in metal sheets.
scanning and imaging the body for stones, tumour and foetus.
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I want complete notes on the chapter friction
In my book subtopics are:
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Some real life based situation where friction is applied.
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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Write the $pH$ value of the
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Write the $pH$ value of the
1. Saliva (before meal)
2. Saliva (after meal)
3. Lemon juice
4. Colourless aerated drink
5. Carrot juice
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