The document discusses properties of electromagnetic waves including: - The frequency of an EM wave is the number of wavelengths that pass by a point in one second. Higher frequencies carry more energy. - All EM waves travel at the speed of light in a vacuum, about 300 million meters per second. - There is a relationship between frequency, wavelength, and speed of light expressed by the equation: wavelength x frequency = speed of light. As frequency increases, wavelength must decrease to maintain this relationship. - Common units for frequency are hertz (Hz) and megahertz (MHz). 1 MHz equals 1 million hertz or cycles per second.

1. Properties of
Electromagnetic Waves
Ms. G. Martin

2. The frequency of an electromagnetic wave is the number of wavelengths that
pass by a point in a second.
The amount of energy that EM wave carries is determined by the
wave’s frequency. That is, the higher the frequency of the EM wave, the more
energy
It possesses.
All EM waves travel through space at the same speed at
approximately (3.00 x 108) meters in one second (about 186, 282 miles per
second) in empty space or vacuum and speed of light c is independent of
both frequency and amplitude of the wave.
What is the relationship between frequency and wavelength? Frequency (f) and
wavelength (λ) are joined by the equation fλ = c, where c is the speed of light.
As the speed of light is constant, if you increase the frequency, the
wavelength must decrease to maintain this equation and vice versa.
Therefore, the wave equation is c = λf

3. The SI derived unit of frequency is the hertz (Hz), named after the
German physicist Heinrich Hertz. One hertz means that an event
repeats once per second.
How to convert Megahertz to 1 Per Second (MHz to 1/s)?
1 MHz = 1,000,000 1/s.
1 x 1,000,000 1/s = 1,000,000 1 Per Second.
In relation to the base unit of [frequency] = (hertz), 1 Megahertz
(MHz) is equal to 1,000,000 hertz, while 1 Per Second (1/s) = 1
hertz.

4. 1 Megahertz
to common frequency
units
1 MHz = 1000000 hertz (Hz)
1 MHz = 1000 kilohertz (kHz)
1 MHz = 1 megahertz (MHz)
1 MHz = 0.001 gigahertz (GHz)
1 MHz = 1000000 1 per second (1/s)

5. Megahertz
to 1 Per Second (table
conversion)
1 MHz = 1000000 1/s
2 MHz = 2000000 1/s
3 MHz = 3000000 1/s
4 MHz = 4000000 1/s
5 MHz = 5000000 1/s
6 MHz = 6000000 1/s

6. Example 1.
What is the wavelength of the radiowave transmitted by an FM radio station
whose frequency is 93. 1 MHz?
Given:
F = 93.1 MHz – 93.1 x 106 s-1
Solution:
Using the relationship among speed, wavelength, and the frequency of a
wave, you have:
since,
𝑚
𝑠
𝑚
𝑠
=
𝑚
𝒔
.
𝒔
1
=
𝑚
1
= m
λ =
𝑐
𝑓
=
3.00 x 108 m/s
93. 1 x 106 s−1 = 3.22 m

7. Example 2.
What is the frequency of a radiowave having a wavelength of 2.93 m?
Solution :
f =
𝑐
λ
=
3.00 x 108 m/s
2.93𝑚
= 102.3 x 106 Mhz