Cutting the Cord: Wireless Communication Principles Quiz

  • 12th Grade
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| Questions: 20 | Updated: Feb 13, 2026
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1. In wireless communication, what is the primary purpose of a "Carrier Wave"?

Explanation

If the energy of a photon is proportional to its frequency (E=hf), then increasing frequency increases the energy of each photon; if the work function of the metal remains constant, then the excess energy provided by the photon must be converted into kinetic energy; therefore, higher frequency results in higher maximum kinetic energy for the electrons.

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About This Quiz
Cutting The Cord: Wireless Communication Principles Quiz - Quiz

Changing the shape of a wave to carry a message. By tweaking frequency and amplitude, raw energy becomes a carrier for complex digital information. This wireless communication principles quiz examines how signals are modulated to keep the world talking.

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2. Frequency Modulation (FM) is more susceptible to atmospheric noise than Amplitude Modulation (AM).

Explanation

If light intensity is defined as the number of photons striking a surface per unit time, then increasing intensity increases the number of available photons; if each photon can eject one electron, then more photons will result in more emitted electrons; therefore, the current (rate of emission) is proportional to intensity.

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3. The process of extracting the original information-bearing signal from a modulated carrier wave is known as ________.

Explanation

If wave theory suggests that light energy is spread out and builds up over time, then it cannot explain the instantaneous emission of electrons at low intensities; if the photoelectric effect shows that energy is delivered in discrete "packets" (photons), then it demonstrates particle-like behavior; therefore, the photoelectric effect is the evidence for the particle nature.

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4. Which phenomenon describes the bending of wireless signals around the corners of buildings or obstacles?

Explanation

If electrons are bound to a metal by atomic forces, then a specific amount of energy must be supplied to break that bond; if this energy is a characteristic property of the material, then it is defined as the work function.

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5. What happens to the signal strength if the distance between the transmitter and receiver is doubled, according to the Inverse Square Law?

Explanation

If de Broglie hypothesized that matter has wave-like properties, then he must relate a wave property (wavelength) to a particle property (momentum); if the relationship is defined by the constant h, then the wavelength λ is equal to Planck's constant divided by momentum (p).

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6. A higher frequency signal generally has a shorter wavelength.

Explanation

If classical wave theory states that light energy depends on intensity (amplitude), then any frequency of light should eventually eject an electron if given enough time; if experiments show that no electrons are ejected below a specific frequency regardless of intensity, then classical theory fails; therefore, the prediction was incorrect.

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7. Which of the following are common types of analog modulation?

Explanation

If the energy of the photon (hf) is used to overcome the work function (ϕ), then hf=ϕ+Kmax​; if f is the threshold frequency (f0​), then hf0​ is exactly equal to ϕ; if the energies are equal, then the remaining kinetic energy must be zero.

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8. The range of frequencies over which a communication system operates is called its ________.

Explanation

If Einstein related photon energy to frequency, then E=hf is relevant; if de Broglie related wavelength to momentum, then λ=h/p is relevant; if the conservation of energy is applied to electron emission, then Kmax​=hf−ϕ is relevant; since F=ma and V=IR are classical mechanics and circuit laws, they are not specific to this quantum topic.

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9. In the context of signal modification, what is "Attenuation"?

Explanation

If momentum p is equal to mass times velocity (mv), then doubling velocity doubles the momentum; if the wavelength λ is h/p, then an increase in the denominator by a factor of 2 results in the value being multiplied by 1/2; therefore, the wavelength is halved.

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10. Digital signals are composed of a continuous range of values.

Explanation

If E is proportional to f, then there must be a mathematical constant to equate them; if Max Planck derived this constant to solve the blackbody radiation problem, then it is called Planck's constant (h).

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11. Which component in a radio receiver is responsible for selecting a specific station's frequency?

Explanation

If a negative potential is applied to the collector to repel electrons, then only electrons with enough energy can reach it; if the potential is increased until the most energetic electron is stopped (Vs​), then eVs​ equals the maximum kinetic energy; therefore, stopping potential measures Kmax​.

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12. In digital communication, the number of bits transmitted per second is known as the ________ rate.

Explanation

If λ=h/p and Planck's constant h is extremely small (6.63×10−34), then a large mass in the denominator will result in an incredibly small wavelength; if the wavelength is smaller than the dimensions of any aperture, then diffraction and wave effects cannot be detected; therefore, the statement is true.

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13. Why are microwave frequencies used for satellite communication?

Explanation

If Einstein published four groundbreaking papers in 1905, then all were significant; if the Nobel committee sought a discovery with clear experimental proof and fundamental impact on quantum theory, then they chose his law of the photoelectric effect; therefore, this was the primary reason for his prize.

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14. Sampling is the first step in converting an analog signal into a digital signal.

Explanation

If the energy of a photon is E=hf, and frequency (f) determines the color in the wave model, then the energy of the individual photon must correspond to that color; if blue light has a higher frequency than red light, then a blue photon has more energy than a red photon.

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15. What is the main advantage of using "Multiplexing" in communication?

Explanation

If a photon behaves like a particle, then it can collide with an electron and transfer momentum; if the photon loses energy during the collision, then its frequency must decrease and its wavelength must increase; if Arthur Compton discovered this shift, then it is the Compton Effect.

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16. The unwanted random electrical energy that interferes with the transmitted signal is called ________.

Explanation

If the frequency is below the threshold, then no individual photon has enough energy to overcome the work function; if the photoelectric effect is a one-to-one interaction between a photon and an electron, then adding more "weak" photons (increasing intensity) still results in zero ejections; therefore, the statement is false.

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17. Which type of signal modification involves increasing the amplitude of a weak signal?

Explanation

If light shows interference (wave) and the photoelectric effect (particle), then it has dual nature; if electrons show diffraction (wave) and collisions (particle), then matter has dual nature; if these properties are universal at the quantum level, then everything exhibits both behaviors.

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18. In Phase Modulation (PM), the frequency of the carrier wave remains constant while its phase changes.

Explanation

If eVs​=hf−ϕ, then the stopping potential (Vs​) depends on the energy of the incoming photons (hf); if the work function (ϕ) is determined by the metal type, then that also affects Vs​; since intensity and area only affect the number of electrons and not their individual energy, they do not affect the stopping potential.

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19. What is the function of a "Transducer" at the start of a communication system?

Explanation

If λ=h/(mv) and both have the same velocity v, then the wavelength depends inversely on mass m; if an electron has a much smaller mass than a proton, then the resulting fraction (h/mv) will be larger for the electron; therefore, the electron has a longer wavelength.

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20. Which factors can cause "Signal Interference" in wireless networks?

Explanation

If stopping potential depends only on the maximum kinetic energy of the electrons, and Kmax​ is determined by the equation hf−ϕ, then changing intensity does not change the energy of individual photons; if the photon energy and work function are unchanged, then Kmax​ and the stopping potential remain exactly the same.

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In wireless communication, what is the primary purpose of a "Carrier...
Frequency Modulation (FM) is more susceptible to atmospheric noise...
The process of extracting the original information-bearing signal from...
Which phenomenon describes the bending of wireless signals around the...
What happens to the signal strength if the distance between the...
A higher frequency signal generally has a shorter wavelength.
Which of the following are common types of analog modulation?
The range of frequencies over which a communication system operates is...
In the context of signal modification, what is "Attenuation"?
Digital signals are composed of a continuous range of values.
Which component in a radio receiver is responsible for selecting a...
In digital communication, the number of bits transmitted per second is...
Why are microwave frequencies used for satellite communication?
Sampling is the first step in converting an analog signal into a...
What is the main advantage of using "Multiplexing" in communication?
The unwanted random electrical energy that interferes with the...
Which type of signal modification involves increasing the amplitude of...
In Phase Modulation (PM), the frequency of the carrier wave remains...
What is the function of a "Transducer" at the start of a communication...
Which factors can cause "Signal Interference" in wireless networks?
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