LET'S TRY: ELECTROMAGNETIC SPECTRUM

Choose the letter of the best answer.

1. What type of waves are used on a TV remote control?

• a. infrared rays

• b. radio waves

• c. ultraviolet

• d. visible light

2. In a radar system the transmitter of the radar is more sensitive than the receiver.

• a. true

• b. false

• c. sometimes

• d. cannot be predicted

3. What are the components of a radar?

• a. satellite, transmitter, and a receiver.

• b. antenna, transmitter, and a receiver.

• c. antenna, satellite, and a receiver.

• d. antenna, transmitter, and a satellite.

4. How does a news broadcast watched around the world?

i. a small antenna sends signals to a communication satellite

ii. radio waves sends signals to a mobile broadcast vehicle back to the station

iii. microwaves transmits television news coverage from mobile broadcast vehicles back to the station

• a. i and ii

• b. ii and iii

• c. i and iii

• d. i, ii and iii

5. Which of the following is a satellite?

• 
• 
• 
• 

6. What is a disturbance that transfers energy?

• a. data

• b. interference

• c. signal

• d. wave

7. What radiation is also used in sterilizing water from drinking fountains?

• a. infrared waves

• b. microwaves

• c. radio waves

• d. ultraviolet

8. What electromagnetic waves are used to treat cancer through the process called radiotherapy?

• a. gamma rays

• b. radio waves

• c. ultraviolet

• d. X-ray

9. What radiation in sunlight produces vitamin D in the skin and gives us tanning effect?

• a. infrared waves

• b. microwaves

• c. radio waves

• d. ultraviolet

10. Which of the following is TRUE about X-rays?

i. Short wavelength X-rays can penetrate even through metals

ii. All X-rays are good, it restores healthy living cells of the body

iii. Long wavelength X-rays can penetrate the flesh but not the bones iv. Too much exposure to X-rays can damage body tissues and can cause cancer.

• a. i and ii

• b. iii and iv

• c. i, ii, and iii

• d. i, iii and iv