Electromagentic waves

Question 1

 How can a station broadcast music

Answer 1

by varying its carrier wave by modulating either its frequency or its altitude

Question 2

how can you produce a carrier wave that goes up to 400 MHz

Answer 2

you use an oscillator with a capacitor and a coil connected in parallel

Question 3

What are transmitters

Answer 3

Devices that converts music words pictures to electric signals and amplifies them then send them to an antenna

Question 4

What does a receiver do

Answer 4

it splits the signals into a binary code to encode it and then the encoded signals become sound waves

Question 5

 How does a radio broadcast

Answer 5

sound waves go into a microphone

Sound waves are changed into electromagnetic waves

They are then amplified and spread by an antenna

Antenna spreads out electric signals

Home radio uses its antenna to receive the electric signals by moving it’s receiver to a specific frequency

Electric signals are then turned into sound waves inside the radio



Question 6

What kind of power do you need to have a changing magnetic field

Answer 6

The power source has to be alternating current

Question 7

What is the antenna supposed to align with to catch the broadcasted signals

Answer 7

The Antinous to align with only the electric waves and parallel

Question 8

What is a capacitor

Answer 8

An electric device used to store electrical energy made up of two conductors separated by insulator

Question 9

What direction do the magnetic and electric field travel in

Answer 9

They travel right-angle to each other and perpendicular to the direction of the wave

Question 10

What is the wavelength of electromagnetic wave in a vacuum

Answer 10

LINDA = c/f

Question 11

what is the Wavelengths equation

Answer 11

LINDA = v/f

Question 12

What is the electromagnetic radiation

Answer 12

It is the energy that is carried by electromagnetic wave

Question 13

what is an antenna

Answer 13

It creates the electromagnetic waves the propagate through the air

Question 14

What’s the dielectric

Answer 14

A poor conductor of electric current who is electric charges partly align with an electric field

Question 15

What’s a carrier Wave

Answer 15

A specific wave length and the radio part of the electromagnetic spectrum that is assigned to a radio station

Question 16

What are the three parts that a station broadcast information by using a transmitter

Answer 16

1.the oscillator generates the carrier wave

2.the modulator uses data to change the carrier waves amplitude or frequency

3. the amplifier increases the potential difference of the resulting signal

Question 17

How do you keep the oscillation study in coil and capacitive circuit

Answer 17

do use a transformer in order to get to the right frequency that will keep the isolation study for as long as possible

Question 18

How do you produce waves with frequencies more than 400 MHz

Answer 18

by using a resonant cavity, I rectangular metal box that acts both as a coil and as a capacitor and its size determines the frequency of oscillation

Question 19

How to produce waves with frequencies higher than 100 GHz

Answer 19

A resonant cavity would have to be reduced to a molecule size

Question 20

What is Piezoelectricity

Answer 20

It’s the property when quartz crystals the form with a potential difference is applied across them, The application of an alternating current potential difference to the quarts Crystal will result in sustained oscillation

Question 21

How are quartz used in electronegativity

Answer 21

Quartz crystals are commonly used to generate electromagnetic waves in electronics

Question 22

Can an ant to know detect a Magnetic wave with a length that’s more than 1/2

Answer 22

Yes it can but I will be less efficient

Question 23

How do you change between stations in a receiver

Answer 23

by adjusting the capacitance and the coil and capacitor circuit that’s in the receiver until the oscillation frequency of the circuit equals the frequency of the desired wave.you do that by using a tuner