1.
The ratio of frequencies of two electromagnetic radiations is 2:1. The wave length of first radiation is
XAº and for the second radiation is 2000 AO. Then the value of 'X' is
a) 2000 AO
b) 1000 A0
c) 4000 Ao
d) 500 A0
Answers
In this module we examine how electromagnetic waves are classified into categories such as radio, infrared, ultraviolet, and so on, so that we can understand some of their similarities as well as some of their differences. We will also find that there are many connections with previously discussed topics, such as wavelength and resonance. A brief overview of the production and utilization of electromagnetic waves is found in Table 1.
Table 1. Electromagnetic Waves
Type of EM wave Production Applications Life sciences aspect Issues
Radio & TV Accelerating charges Communications remote controls MRI Requires controls for band use
Microwaves Accelerating charges & thermal agitation Communications, ovens, radar Deep heating Cell phone use
Infrared Thermal agitations & electronic transitions Thermal imaging, heating Absorbed by atmosphere Greenhouse effect
Visible light Thermal agitations & electronic transitions All pervasive Photosynthesis, Human vision
Ultraviolet Thermal agitations & electronic transitions Sterilization, Cancer control Vitamin D production Ozone depletion, Cancer causing
X-rays Inner electronic transitions and fast collisions Medical Security Medical diagnosis, Cancer therapy Cancer causing
Gamma rays Nuclear decay Nuclear medicine, Security Medical diagnosis, Cancer therapy Cancer causing, Radiation damage
CONNECTIONS: WAVES
There are many types of waves, such as water waves and even earthquakes. Among the many shared attributes of waves are propagation speed, frequency, and wavelength. These are always related by the expression vW=fλ. This module concentrates on EM waves, but other modules contain examples of all of these characteristics for sound waves and submicroscopic particles.
As noted before, an electromagnetic wave has a frequency and a wavelength associated with it and travels at the speed of light, or c. The relationship among these wave characteristics can be described by vW = fλ, where vW is the propagation speed of the wave, f is the frequency, and λ is the wavelength. Here vW = c, so that for all electromagnetic waves, c = fλ.
Thus, for all electromagnetic waves, the greater the frequency, the smaller the wavelength.
Figure 1 shows how the various types of electromagnetic waves are categorized according to their wavelengths and frequencies—that is, it shows the electromagnetic spectrum. Many of the characteristics of the various types of electromagnetic waves are related to their frequencies and wavelengths, as we shall see.
An electromagnetic spectrum is shown. Different wave category regions are indicated using double sided arrows based on the values of their wavelength, energy, and frequency; the visual strip is also shown. The radio wave region is further segmented into AM radio, FM radio, and microwaves bands.
Figure 1. The electromagnetic spectrum, showing the major categories of electromagnetic waves. The range of frequencies and wavelengths is remarkable. The dividing line between some categories is distinct, whereas other categories overlap.
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