(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.

Complete the following radioactive reaction:

\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]

In the following atoms, which one is a radioisotope? Give one use of this isotope.

O¹⁶, C¹⁴, N¹⁴, He⁴

Name the radiations that are emitted during the decay of a nucleus, which has highest penetrating power?

Does the emission of gamma radiation result in a change in the mass number?

A radioactive nucleus X emits an alpha particle followed by two beta particles to form nucleus Y.

1. With respect to the element X, where would you position the element Y in the periodic table?
2. What is the general name of the elements X and Y?
3. If the atomic number of Y is 80 then what is the atomic number of X?