Which of the following is incorrect about Beta-rays?

It has very poor penetrating power.

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It has a charge of -1.

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It is emitted from nucleus of a radioactive element.

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It has mass.

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Solution

The correct option is A
It has very poor penetrating power.

Beta radiation takes the form of either an electron or a positron (a particle with the size and mass of an electron, but with a positive charge) being emitted from a nucleus. Beta particles travel at about 90 percent of the speed of light!

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Which out of the following statements is a characteristic of an alpha particle?

I. It is positively charged.

II. It has no mass or charge.

III. It's symbol is $_{- 1}^{0} e$ .

IV. It has poor penetrating ability.

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