1.
Alpha (α) particles are helium (He) nucleus with a charge of

2.
When two light nuclei combine to form a heavier nucleus, the process is said to be

3.
If a C-14 has a half-life of 5730 years, then how long will it take for the number of C-14 in a sample to drop to 1/8 of initial quantity?

4.
In the nuclide defined by &¹⁵&₇X, the number of protons and neutrons respectively are

5.
The elements which emit natural radioactivity are known as

6.
In SI base units, 1 Bq is equal to

7.
A helium nucleus comprising of two protons and two neutrons with a charge of 2e is

8.
Radiations present in atmosphere due to different radioactive substances are called

9.
Gamma (γ) radiation are fast moving

10.
In air, alpha particles have range of

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