radioactivity (K.Aysha siddika 23-CH-15)

Front

What is radioactivity?

Back

Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation. This can occur in the form of alpha particles, beta particles, or gamma rays.

Front

Who discovered radioactivity?

Back

Marie Curie is credited with the discovery of radioactivity, along with Henri Becquerel.

Front

In which year did Marie Curie discover polonium?

Back

Marie Curie discovered polonium in 1896.

Front

What are the three types of radiation emitted by radioactive substances?

Back

The three types of radiation are alpha particles, beta particles, and gamma rays.

Front

In which year did Rutherford establish that rays emitted by radioactive substances are three types?

Back

Rutherford established this in 1904.

Front

Is radium more radioactive than uranium?

Back

Yes, radium is more radioactive than uranium.

Front

What is the penetrating power of alpha particles?

Back

Alpha particles have low penetrating power and can be stopped by a sheet of paper.

Front

What is the penetrating power of beta particles?

Back

Beta particles have moderate penetrating power and can penetrate paper but are stopped by a few millimeters of plastic or glass.

Front

What is the penetrating power of gamma rays?

Back

Gamma rays have high penetrating power and can pass through most materials, requiring dense materials like lead or several centimeters of concrete to be stopped.

Front

What is a photographic plate used for in radioactivity?

Back

A photographic plate is used to detect and record the presence of radiation.