Gamma rays, x-rays, visible light, and radio waves are all types of

Electromagnetic waves

Explanation:-

Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They can travel in vacuum as well and travel with the speed of light.

Gamma rays, X-rays , visible light and radio waves are all types of electromagnetic waves and arranged in order of increasing frequencies or decreasing wavelengths.

The relationship between wavelength and frequency of the wave follows the equation:

where,

= frequency of the wave

c = speed of light  

= wavelength of the wave

From the above relation, it is visible that wavelength and frequency follow inverse relation.

ill do it for 100, also this isnt 80 its 40

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.