Question

List the following types of electromagnetic radiation in order of increasing wavelength:

(a) The gamma rays produced by a radioactive nuclide used in medical imaging;

(b) Radiation from an FM radio station at 93.1 MHz on the dial;

(c) A radio signal from an AM radio station at 680 kHz on the dial;

(d) The yellow light from sodium vapor streetlights;

(e) The red light of a light-emitting diode, such as in a calculator display.

Answer 1

The electromagnetic spectrum in increasing order of wavelength is as follows:

 

Gamma rays < X-rays < UV < Visible < IR < Microwaves < Radio-waves  

 

Waves from FM radio and Am radio are radio waves, waves from sodium lamp fall in the visible range, the red light from a light-emitting diode falls into the 1R range.

 

In between option (b) and (c), the frequency of 93.1 MHz which is greater than 680 kHz. Thus, wavelength for (b) is less than wavelength for (c).

 

Therefore, the decreasing order of wavelength is as follows: 

(c) > (b) > (e) > (d) > (a)

The electromagnetic spectrum in increasing order of wavelength is as follows:

 

Gamma rays < X-rays < UV < Visible < IR < Microwaves < Radio-waves