Review Time Part 1

Who developed a scientific theory that explains electromagnetic waves?

• Hans Christian Oersted

• Heinrich Hertz

• James Clerk Maxwell

• Michael Faraday

Which of the following electromagnetic waves have the shortest wavelength and highest frequency?

• Infrared

• Microwaves

• Ultraviolet

• Visible Light

What is the frequency of electromagnetic radiation if the distance of the crest to its successive crest is 1.00 X 10^-10 m?

• 3.00 x 10⁸ Hz

• 3.00 x 10¹⁸ Hz

• 3.00 x 10^-8 Hz

• 3.00 x 10^-18 Hz

Which type of electromagnetic wave is 3.00x10¹⁸ Hz given the values below?

• Infrared

• Gamma Ray

• Ultraviolet Ray

• X-Ray

An EM wave was transmitted with the speed of 3 X 10⁸ m/s, what would happen to its wavelength if the frequency was doubled?

• Reduced in half

• Doubled

• Tripled

• Remains the same.

How do you describe the oscillation of electric field and magnetic field in the direction of electromagnetic wave?

• Alternating

• Opposite

• Parallel

• Perpendicular

Gamma ray is used in a wide range of applications due to its high energy. How are gamma rays used in the food industry?

• Warming Food

• Examining the taste of food

• Food Irradiation

• Breaking food into smaller pieces

Which of the following applications uses microwaves as a detection system to determine the range, angle, or velocity of objects?

• CT (Computed Tomography) scan

• MRI (Magnetic resonance imaging)

• RADAR (RAdio Detection And Ranging)

• SONAR (SOund Navigation And Ranging)

Which layer of the Earth's atmosphere allows radio waves to be reflected to the Earth, allowing long-distance communication?

• Exosphere

• Ionosphere

• Mesosphere

• Troposphere

Counterfeit money detectors are used to determine counterfeit banknotes (paper bill), how do EM wave help in detecting fake money?

• By heating the paper using a MICROWAVE and having its remains examined in the laboratory.

• By illuminating the paper bills with ULTRAVIOLET RAYS and seeing their unique markings.

• By reading the information with VISIBLE LIGHT contained in the paper bills.

• By measuring the exact dimensions using GAMMA RAY of the paper bills.