Communication waves

Optical fibers are used to transfer information in the form of light over long distances. Which of the following explains how light travels through an optical fiber?

• Light enters the optical fiber.

• Any light that hits the side of the fiber gets refracted within the fiber instead of exiting the fiber.

• Any light that hits the side of the fiber gets reflected within the fiber instead of exiting the fiber.

• Optical fibers work because of total internal reflection.

• Optical fibers work because of total internal refraction.

What may happen if an optical fiber is bent too far?

•  It will have total internal reflection.

• It will leak light, which is called total internal reflection.

• It will lose total internal reflection, and the light will be lost to diffraction.

• It will lose total internal reflection, and the light will be lost to refraction.

Which of the following would you do to increase the resolution of this image?

• Use a better camera.

• Increase the number of pixels.

• Collect more data by having smaller pixels.

• Collect more data by having bigger pixels.

What are some advantages of communicating through digital waves compared to analog waves?

• Digital waves tend to have lower resolution and worse sound.

• Digital waves tend to have higher resolution and better sound.

• They can be copied and stored reliably.

• They are harder to copy and store.

True or False: Modulated waves can be analog or digital.

• True

• False

True or False: Analog waves are low frequency.

• True

• False

True or False: Analog communication is mechanical, not electric.

• True

• False

True or False: Radio waves are part of the electromagnetic spectrum.

• True

• False

Which type of light has the lowest energy of this group?

• Radio
• Microwave
• Infrared
• Ultraviolet

Which of the following answer choices explains what digital means?

• Data expressed as single digits, usually 0 and 1

• Smooth and continuous data

• Electrical

• computerized