Question

1. Which electromagnetic wave do humans use the most?

2. What waves are used in cellular phones (iPhones, mobile units, smart phones)?

3. Write the negative impact of these waves on human health.

4. Write the advantage of satellite communication over wave communication.

5. What are some of the impact of modern communication in our socio-economic life? List any two.​

Answer 1

1) Visible light
2) Radio waves
3) High doses of radio frequency radiation raises body temperature, even to the point of being fatal.
4) Satellites may be designed to provide signals to areas as small as a city or as large as a country.
5) i. Modern communication reduces the importance of distance in work.
ii. Although distant learning ha existed for some time, the internet causes a large expansion in coverage and better delivery of instructions.

Answer 2

1 radio wave

2 radio wave

3