Question

Arrange the following type of radiations in increasing order of frequency: (a) radiation from microwaves oven (b) amber light from traffic signal (c) radiation from FM radio (d)cosmic rays from outer space and (e) X-rays

Answer 1

Hint: Results observed that the interactions of radiations with the matter have provided more information regarding the structure of atoms and molecules. From these results, Neils Bohr improved a model which is proposed by Rutherford. Two major developments by Bohr’s model of an atom.

Complete step by step solution:
Two important developments played a major role in the formation of Bohr’s model of an atom. These are:
(i) Dual character of electromagnetic radiation
(ii) Experimental results of atomic spectra
Different types are used to represent electromagnetic radiation. These radiations are characterized by the properties of wavelength and frequency. Various types of electromagnetic radiations will differ from their wavelength and frequency.

Increasing order of given types of radiations from the above picture,
Cosmic rays from outer space > X-rays > amber light from traffic signal > radiation from microwaves oven> radiation from FM radio
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From the above order, cosmic rays from outer space have high frequency and radiations from FM radio have lesser frequency than other types of radiations given.

Note: Especially in spectroscopy, a commonly used quantity is the wave number. This is defined as the number of wavelengths per unit length. Its unit is the reciprocal of the wavelength unit $c{{m}^{-1}}$ . Small waves of different kinds in electromagnetic radiation have smaller wavelengths and smaller units.