C. Assessment/Application/Outputs (Please refer to DepEd Order No. 31, s. 2020) Directions: Choose the letter of the correct answer. Write your answer on a separate sheet of paper.
Example:
Which of the following is NOT an electromagnetic wave?
A. infrared
B. radio
C. sound
D. X-ray
Answer: C
Start here:
1. How does the wavelength of infrared (IR) compare with the wavelength of ultraviolet (UV) waves?
A. Infrared waves have a longer wavelength.
B. Infrared waves have a shorter wavelength.
C. IR waves have the same wavelength as the UV waves.
D. IR waves are not comparable in wavelength with the UV waves.
2. Among all the electromagnetic waves (EM), which has the highest frequency?
A. infrared radiation B. gamma rays
C. radio waves D. ultraviolet light
3. ROYGBIV is the basic component of white light. Which color of light carries the highest energy?
A. blue
B. green
C. orange
D. violet
4. Light is an electromagnetic wave. Which characteristic is common in all electromagnetic waves in a vacuum?
A. amplitude B. frequency
C. speed
D. wavelength
5. Which of the following is NOT true about the nature of light?
A. Light is an electromagnetic wave.
B. Light is a mixture of ROYGBIV colors of light.
C. Light is a form of energy that travels in space.
D. Light has a constant speed of 3 x 108 m/s in any medium.
6. Which electromagnetic wave is used in a microscope?
A. infrared radiation B. gamma rays
C. visible light
D. ultraviolet light
7. When the red light is compared with violet light in a vacuum.
A. both travel at the same speed
B. both have the same frequency
C. both have the same wavelength
D. red light travels faster than violet light
с переводом:
PRINCIPLES OF RADIO COMMUNICATIONS
Developing an understanding of radio communications begins with the
comprehension of basic electromagnetic radiation.
Radio waves belong to the electromagnetic radiation family, which includes
x-ray, ultraviolet, and visible light — forms of energy we use every day. Much
like the gentle waves that form when a stone is tossed into a still lake, radio
signals radiate outward, or propagate, from a transmitting antenna.
However, unlike water waves, radio waves propagate at the speed of light.
Radio wave amplitude, or strength, can be visualized as its height —
the distance between its peak and its lowest point. Amplitude, which is
measured in volts, is usually expressed in terms of an average value called
root-mean-square, or RMS.

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