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# Mobile Communications & Wireless Technology - Sem 7

Created by
@StylishSpessartine

## Questions and Answers

### What is defined as the distance from crest to crest in a wave?

• Frequency
• Wavelength (correct)
• Amplitude
• Energy
• ### What happens to wavelength as frequency increases?

• Wavelength oscillates unpredictably
• Wavelength becomes larger
• Wavelength becomes smaller (correct)
• Wavelength remains constant
• ### What determines whether electrons are ejected from a metal when light is shone on it?

• The frequency of the light (correct)
• The wavelength of the light
• The energy of the light
• The brightness of the light
• ### Which phenomenon illustrates that electrons can exhibit wave-like behavior?

<p>Interference pattern created by electrons fired at two slits</p> Signup and view all the answers

### What is the speed of electromagnetic waves in a vacuum?

<p>300,000 km/sec</p> Signup and view all the answers

### What physical property can be varied in data communication to transmit information?

<p>Voltage and current</p> Signup and view all the answers

### What is the role of the electric fields created by moving electric charges?

<p>To surround and interact with other charges</p> Signup and view all the answers

### What phenomenon occurs when a changing magnetic field creates a changing electric field?

<p>Induction</p> Signup and view all the answers

### What do electromagnetic waves consist of?

<p>Vibrations in electrical and magnetic fields</p> Signup and view all the answers

### What device uses the principle of changing electric current to create a changing magnetic field?

<p>Transformer</p> Signup and view all the answers

### The number of oscillations per second of a wave is called its ______, measured in Hertz (Hz).

<p>frequency</p> Signup and view all the answers

### The distance between two consecutive maxima is called the ______, universally designated by the Greek letter λ.

<p>wavelength</p> Signup and view all the answers

### Whether or not electrons are ejected depends upon ______ not the amplitude of the light.

<p>frequency</p> Signup and view all the answers

### EM waves can behave as a particle called a ______ whose energy depends on the frequency of the waves.

<p>photon</p> Signup and view all the answers

### All EM waves travel at a speed of ______ km/sec in space.

<p>300,000</p> Signup and view all the answers

## Study Notes

### Data Communication

• Information transmission occurs over wires by altering physical properties like voltage and current.
• A signal can be mathematically modeled as a function of time, f(t).
• Key components include a transmitter, receiver, and transmission medium, which can be electric current, light, or electromagnetic waves.

### Electromagnetic Fields

• Moving electric charges generate electric and magnetic fields.
• A changing magnetic field induces a changing electric field, demonstrated by transformers.
• The main coil of a transformer creates a changing magnetic field through variable electric current.

### Electromagnetic Waves

• Electric and magnetic fields continuously generate each other, forming electromagnetic waves.
• These waves propagate as vibrations in electrical and magnetic fields, exhibiting both magnetic and electric properties.

### Wavelength & Frequency

• Frequency (f), measured in Hertz (Hz), represents the number of oscillations per second of a wave.
• As frequency increases, the wavelength (λ) decreases; wavelength is defined as the distance between successive crests or troughs.

### Wave-Particle Duality

• Heinrich Hertz discovered that light can eject electrons from metals; the phenomenon is influenced by light's frequency, not its brightness.
• Albert Einstein further explained that electromagnetic waves can act as particles, named photons, with energy dependent on their frequency.
• Electrons can display wave-like behavior, as shown in the double-slit experiment, creating interference patterns.

### Speed of Electromagnetic Waves

• All electromagnetic waves travel at the speed of light, approximately 300,000 km/s in a vacuum, which is the universal speed limit in nature.

### Data Communication

• Information transmission occurs over wires by altering physical properties like voltage and current.
• A signal can be mathematically modeled as a function of time, f(t).
• Key components include a transmitter, receiver, and transmission medium, which can be electric current, light, or electromagnetic waves.

### Electromagnetic Fields

• Moving electric charges generate electric and magnetic fields.
• A changing magnetic field induces a changing electric field, demonstrated by transformers.
• The main coil of a transformer creates a changing magnetic field through variable electric current.

### Electromagnetic Waves

• Electric and magnetic fields continuously generate each other, forming electromagnetic waves.
• These waves propagate as vibrations in electrical and magnetic fields, exhibiting both magnetic and electric properties.

### Wavelength & Frequency

• Frequency (f), measured in Hertz (Hz), represents the number of oscillations per second of a wave.
• As frequency increases, the wavelength (λ) decreases; wavelength is defined as the distance between successive crests or troughs.

### Wave-Particle Duality

• Heinrich Hertz discovered that light can eject electrons from metals; the phenomenon is influenced by light's frequency, not its brightness.
• Albert Einstein further explained that electromagnetic waves can act as particles, named photons, with energy dependent on their frequency.
• Electrons can display wave-like behavior, as shown in the double-slit experiment, creating interference patterns.

### Speed of Electromagnetic Waves

• All electromagnetic waves travel at the speed of light, approximately 300,000 km/s in a vacuum, which is the universal speed limit in nature.

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## Description

This quiz covers key concepts in mobile communications and wireless technology, focusing on topics such as data communication, network elements, and specific challenges like hidden terminal and fading problems. Understand both infrastructure and infrastructure-less modes of wireless networks as you prepare for your assessments.

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