WorksheetsPractical Applications and Effects of Electromagnetic Spectrum
Total questions: 15
Worksheet time: 21mins
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
The sterilization of medical instruments and water in drinking fountains are made possible with the application of which types of electromagnetic waves?
infrared and x-ray
radio waves and micro waves
gamma rays and ultraviolet rays
all of the above
Which statement about light rays in the figure is true?
The light originates from the boy’s eyes.
The light originates from the bird’s eye.
The image of the bird creates light rays.
The light originates from the bird.
Mirrors formed its image through reflections. Which of the following best describes the images formed by a plane mirror?
virtual, inverted and enlarged
real, inverted and reduced
upright and the same size as the objects
virtual, upright and the same size as the object
Evaluate the following statement. Which of the following statement is TRUE?
A plane mirror produces inverted images.
Only virtual images can be projected on a screen.
The image formed by plane mirror is always virtual.
A light ray passing through the center of the mirror will not be reflected.
When light is incident at the mirror’s surface at 30 degrees, what do you think will happen to the ray after hitting the mirror?
It will bounce off the surface at 30 degrees with the normal line.
It will bounce off the surface at 60 degrees with the normal line.
The light ray will be refracted away from the normal line.
The light ray will be absorbed.
A 4.0-cm tall light bulb is placed a distance of 8.3 cm from a concave mirror having a focal length of 15.2 cm. Determine the image distance.
18.3 cm
10.2 cm
5.3 cm
2.4 cm
Determine the focal length of a curved mirror that produces an image that is 16.0 cm behind the mirror when the object is 28.5 cm from the mirror. What type of curved mirror was used?
-36.5 cm , Convex
36. 5cm, Concave
-10.2 cm , Convex
10.2 cm , Concave
Light rays are incident at the surface of a concave mirror. It has been observed that the rays met 20cm away from its vertex. If the object is 12 cm from the mirror, what will be the magnitude of the image distance?
7.5 cm
15 cm
20 cm
30 cm
