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Radio Waves and Marconi's Invention Quiz

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Radio Waves and Marconi's Invention Quiz

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Questions and Answers

What is the main difference between AM and FM radio stations?

AM stations use frequency modulation while FM stations use amplitude modulation. (correct)

FM stations have wider range of wavelengths than AM stations.

AM stations have higher carrier frequencies than FM stations.

FM stations transmit sound and picture information over long distances.

Who is credited with inventing wireless communication?

Nikola Tesla

Guglielmo Marconi (correct)

Alexander Graham Bell

Thomas Edison

How were the first digital wireless signals translated into words?

By translating long and short pulses into Morse code (correct)

By varying the frequency of the carrier wave

Using only audio signals

Through modulating carrier frequencies

What is the purpose of modulating the carrier wave in radio communication?

To encode the intended message Signup and view all the answers

What frequency range do AM radio stations typically operate within?

Between 530 kHz to 1700 kHz Signup and view all the answers

How did Marconi establish the first transatlantic 'wireless communication'?

By sending messages without wires at the speed of light Signup and view all the answers

What is the primary reason why UV-C rays are considered the most harmful?

They are completely absorbed by the atmosphere Signup and view all the answers

Why did Johann Wilhelm Ritter place silver chloride beyond the violet spectrum during his experiment on ultraviolet light?

To demonstrate the unique properties of ultraviolet light Signup and view all the answers

What is the closest type of ultraviolet light to visible light?

UV-A Signup and view all the answers

Why did Wilhelm Conrad Roentgen call X-rays 'X'?

Because they have unknown properties Signup and view all the answers

What distinguishes gamma rays from other waves in terms of energy and wavelength?

Smallest wavelength and highest energy Signup and view all the answers

What is the main application of X-ray Screening Systems in airports, courthouses, and prisons?

Providing detailed images for security purposes Signup and view all the answers

What range does the INFRARED (IR) spectrum cover?

700 nm to 1 mm Signup and view all the answers

How does the wavelength of infrared (IR) light compare to that of visible light?

Longer than visible light Signup and view all the answers

What is the purpose of thermal imaging?

To sense heat emitted by objects Signup and view all the answers

How is visible light refracted by a prism?

Violet light is most refracted, red light is least refracted Signup and view all the answers

Why does Earth's atmosphere typically appear blue?

As a result of nitrogen and oxygen particles scattering blue light energy Signup and view all the answers

What causes objects to change color as they heat up?

Emission of energy with shorter wavelengths Signup and view all the answers