Practical Applications and Effects of Electromagnetic Waves

The effect of EM radiation on organisms and environment depends on how much energy it carries. How does the energy level change from gamma ray to radio wave?

• increases

• decreases

• cannot be determined

• energy level does not change

We are exposed to low levels of non-ionizing radiation every day. When the exposure is intense and direct, it may result in damage to tissue due to heat. Which of the following group of EM waves are non -ionizing radiation?

• radio waves, microwaves, infrared

• visible light , ultraviolet, X-ray

• infrared, microwaves, gamma rays

• gamma, infrared, ultraviolet

Excessive exposure to ionizing radiations can alter molecules within the cells and may cause eventual harm such as skin or tissue damage, cancer and death. Which of the following sets of EM radiation can harm your body cells?

• light waves , ultraviolet, X-ray

• infrared, microwaves, ultraviolet

• gamma ray, ultraviolet ray, X-ray

• gamma ray, microwaves, infrared

X-rays can penetrate skin and muscles. It is useful in diagnosing bone fractures and tumors. But too much exposure to x-rays has bad effects to the body. Which of the following is the negative effect of x-rays?

• It can sustain the balance in the body.

• It can destroy the metabolism of the body.

• It can maintain blood circulation of the body.

• It can damage healthy living cells of the body.

Global Positioning System (GPS) is widely used nowadays. The GPS tracking system uses the Global Navigation Satellite System network. This network incorporates a range of satellites that use microwave signals that are transmitted to GPS devices. What information does GPS devices give?

• your exact location on earth

• television station you are tuned in

• who is sending message to your phone

• data of video game you can play on your phone

Infrared technology provides numerous advantages especially in wireless communication. EXCEPT

• Transmitters and receivers should be directly aligned to connect and communicate.

• Simple circuitry can be incorporated in the integrated circuit of a product.

• Low power requirements that makes it ideal for any technological devices.

• Not likely to interfere to signals from other services.

After walking outside on a bright sunny day. We experience dimming in vision and sometimes we see violet spots. Why is this so?

I. due to overexposure to UV radiation

II. due to overexposure to visible light

III. due to overexposure to infrared radiation

• I only

• II only

• II and III

• I, II and III

What electromagnetic wave induces cancer and genetic defects?

• microwave

• infrared

• gamma rays

• ultraviolet rays

What electromagnetic wave is radiated by plants and animals as heat waves?

• microwave

• infrared

• gamma rays

• ultraviolet rays

Which electromagnetic wave accelerates the aging process of the skin?

• microwave

• infrared

• gamma rays

• ultraviolet rays