In which type of radiation do the mass number and atomic number remain unchanged?

What are the different regions of the electromagnetic spectrum?

$A$ hypothetical electromagnetic wave is shown in the figure. Find out the wavelength of the radiation.

It is observed that characteristic $X$-ray spectra of elements show regularity. When frequency to the power '$n$' i.e.,$v^{n}$ of $X$-rays emitted is plotted against atomic number '$Z$',the following graph is obtained. The value of '$n$' is

$A$ metal surface emits photoelectrons when the incident radiation possesses a minimum.....

Chlorophyll present in green leaves of plants absorbs light at $4.620 \times 10^{14} \ Hz$. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?