Which of the following is emitted in a process of natural radioactivity?
In which of the following situations is photoelectric effect employed?
I. Automatic devices for switching on light at dusk
II. Automatic doors in departmental stores
III. Automatic devices for switching on air conditioners
IV. Automatic voltage stabilizers
Which of the following radiations has the longest wavelength?
In which of the following fields is radioisotopes not used?
A nuclide is represented by \(_{32}^{70}B\). Determine its neutron-proton ratio
