Difficulty: Easy
Correct Answer: All of the above
Explanation:
Introduction / Context:
Modern communication systems rely heavily on wireless transmission of information, including radio broadcasting, television, mobile phones, Wi Fi, and remote controls. All of these technologies use different parts of the electromagnetic spectrum to transmit signals without physical wires. This question asks which types of electromagnetic waves can be used for wireless communication, testing basic knowledge of physics and communication technology.
Given Data / Assumptions:
Concept / Approach:
The electromagnetic spectrum includes a wide range of waves, from radio waves to gamma rays. Different communication technologies use different frequency bands. Radio waves are used for AM and FM radio, television broadcasting, and many mobile communication systems. Microwaves are used for satellite communication, radar, and certain Wi Fi and cellular services. Infrared waves are used in remote controls, some short range data links, and infrared communication systems. All of these are forms of wireless transmission because they send information through air or vacuum via electromagnetic waves rather than through a cable. Therefore, each of the specific wave types listed can be used for wireless communication.
Step-by-Step Solution:
1. Consider radio waves. These long wavelength waves are widely used for radio and television broadcasting and many early wireless communication systems.2. Consider microwaves. Higher frequency microwaves are used for satellite communication, radar, and some mobile and Wi Fi networks.3. Consider infrared waves. Infrared light is used for short range communication, such as in television remote controls and some data transfer devices.4. All three types of waves are used in different communication applications, but they share the property of transmitting information wirelessly through space.5. Therefore, the correct answer is that wireless transmission can be done via all of the listed waves.
Verification / Alternative check:
Examples from everyday life support this conclusion. When you change channels on a television using a remote, the remote typically uses infrared signals. When you tune into an FM radio station, you are receiving information carried by radio waves. Mobile phones, satellite TV, and some Wi Fi technologies operate using microwave frequencies. Textbooks and communication engineering materials classify all these as wireless communication methods because they use electromagnetic waves propagating through air or space. Hence, it is clear that not just one but all three wave types can be used for wireless transmission.
Why Other Options Are Wrong:
Option A, “Infrared waves,” is not fully correct on its own because although infrared is used in some wireless devices, it is not the only type of wave used. Option B, “Radio waves,” is also only partially correct, since many important wireless systems rely on microwaves or infrared. Option C, “Microwaves,” similarly covers only a subset of wireless technologies. The question asks which waves can be used for wireless transmission, and since all three listed types are used in practice, the only complete answer is “All of the above.”
Common Pitfalls:
Some learners may associate wireless only with radio waves because of the historical use of radio broadcasting. Others may think of Wi Fi and microwave ovens and assume only microwaves are relevant. It is also easy to overlook infrared because it is less visible in large scale communication systems, even though it is present in everyday remote controls. To avoid these misunderstandings, remember that wireless transmission is a general concept and that different technologies choose different portions of the electromagnetic spectrum based on distance, data rate, and equipment design.
Final Answer:
Wireless transmission of signals can be carried out using infrared waves, radio waves, and microwaves, so the correct choice is “All of the above.”
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