Proponents
Discovered that electric current in a wire can deflect a magnetized compass needle,
Hans Christian Ørsted
In electromagnetic wave spectrum, which electromagnetic wave has the highest frequency?
Gamma Ray
Which of the following describes the number of wave cycles per unit time?
frequency
3x108 m/s
Gamma Rays
Less than 0.01 nm
Formulated the law of electromagnetism
Andre Marie Ampere
Considering that electromagnetic spectrum is arranged in decreasing frequency order, what should be the 6th electromagnetic wave?
Microwave
How does wavelength of a wave relate to its frequency?
If frequency increases, the wavelength decreases.
Unit of Frequency
one cycle per second (Hz)
X-rays
0.01-10 nm
Contributed to the study of electromagnetism and electrochemistry
Michael Faraday
What is the common form of electromagnetic wave used by cellular phones?
Radio wave
What happens to the speed of a wave if the frequency is doubled?
also doubled
Wave speed, frequency, and wavelength equation
v=λf
Ultraviolet
10nm - 400nm
Developed a scientific theory to explain electromagnetic waves.
James Clerk Maxwell
Which of the following electromagnetic waves commonly cause visual problems?
Ultraviolet ray
Given the wavelength of a microwave which is 1 x 10-3 m, what would be the frequency if the wave travels in vacuum?
3.0 x 1011 Hz
Consider the arrangement of electromagnetic waves: Gamma ray – X-ray – Ultraviolet ray – Visible light – Infrared – Microwave - Radio wave, which of the following describes the arrangement?
Increasing Wavelength
Visible
390 nm - 750 nm
The unit of frequency of a radio wave (one cycle per second) is named after
Heinrich Rudolf Hertz
What form of electromagnetic wave that can only be observed by our naked eye?
Visible light
If an electromagnetic wave travelling in vacuum enters through a different material, what would be its speed if it is decreased by half?
1.5 x 108 m/s
Why can X-rays be used in investigating bone fractures?
A. Because muscle tissues absorbed more x-rays than bone structures.
B. Because X-rays with lower frequencies can pass through bones structures and tissues.
C. Because bone structures and tissues in our body can withstand x-ray radiation since it has lesser wavelength.
D. Because X-rays travel through the body and are absorbed in different amounts by different tissues, depending on density of the tissues.
Radio
1 mm - km