Exercise XV — task. Science CBSE, Class 9.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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State whether true or false. If false, correct the statement:

a. The mass of an electron is about \(\frac{1}{2000}\) times that of proton.

An electron has a mass of nearly \(\frac{1}{2000}\) times that of a proton.
A proton's mass is roughly \(\frac{1}{2800}\) times that of an electron.

b. An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Making tincture iodine, which is used as a medicine, requires an isotope of iodine.
An isotope of iodine is used as a tracer to determine the manner and rate of iodine intake by the thyroid gland in our body.

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