Radio Waves

Question 1

they are waves that are made up of oscillating electric and magnetic fields.

Answer 1

Electromagnetic Waves

Question 2

Are all EM Waves transverse waves?

Answer 2

Yes, all EM Waves are transverse waves.

Question 3

What is the meaning of transverse waves?

Answer 3

Waves that oscillate perpendicular to the direction of energy transfer.

Question 4

What is the relationship of the wavelength and frequency of the electromagnetic waves?

Answer 4

Inversely related

Question 5

When can we experience electromagnetic waves?

Answer 5

We can experience it by listening to a radio, perceiving visible light, even using our phones!

Question 6

Electromagnetic spectrum are split in 7 types which are?

Answer 6

Radio waves, Microwaves, Infrared light, Visible light, Ultraviolet light, X-Rays, and Gamma Rays

Question 7

What are radio waves?

Answer 7

A part of the electromagnetic spectrum where the wavelengths are longer than infrared light.

Longest wavelength but Lowest frequency (High: 300 GHz to low as 3 KHz)

Question 8

Who discovered Radio Waves?

Answer 8

Heinrich Hertz, a German physicist and experimentalist who demonstrated that EM Waves predicted by James Clark Maxwell actually exist.

Question 9

When did Heinrich Hertz proved the existence of Radio Waves?

Answer 9

in the late 1880s

Question 10

What are short radio waves?

Answer 10

• Use frequencies that come under the HF band of radio waves.
• Wavelength: 1.7 megahertz to 30 megahertz
• Used for telecommunication services

Question 11

What is the low to medium frequency range?

Answer 11

— A range of 535 kilohertz to 1.7 megahertz
— shortest waves in the radio wave band
— easily travel underwater and penetrate rocks
— widely used for underwater purposes, submarines, mining and geothermal activities

Question 12

What is the higher frequency range?

Answer 12

— ranges HF, VHF, and UHF are used by FM radio, which are used to communicate public radio service, cellphones and GPS.

— these waves transfer the information with the least disturbance and are used to send communication signals.

Question 13

What is the highest frequency range?

Answer 13

— the SHF and EHF, they have some features of microwaves
— they have very limited applicate and are mostly used for scientific purposes

Question 14

Radio waves have ______ wavelength but ______ frequency

Answer 14

longest, lowest

Question 15

When an electrical charge is accelerated, it generates a changing magnetic field, which in turn generates a _______ field.

Answer 15

changing electric

Question 16

When an electrical charge is accelerated, it generates a changing magnetic field, which in turn generates a _______ field.

Answer 16

changing electric

Question 17

Radio waves are produced when the alternating current flows through the ________

Answer 17

Antenna or electrical conductor

Question 18

How did Heinrich Hertz discover Radio Waves?

Answer 18

Heinrich Hertz used a spark gap that is attached to an induction coil and a separate spark gap in the receiving
antenna.

When waves created by the sparks of the coil transmitter were picked up by the receiving antenna, sparks would jump its gas as well.

Question 19

It is a pure wave of constant frequency, a bit like a sine wave and has imposed on it, the more complex wave of the signal information

Answer 19

Carrier wave

Question 20

The process of imposing an input signal

Answer 20

modulation

Question 21

They are power amplifier which provides enough power to generate radio frequency electric currents in the conducting broadcast antenna

Answer 21

Transmitters

Question 22

Their signals are _____ through the atmosphere

Answer 22

Bounced

Question 23

Referred to as the height of the Radio Wave.

Answer 23

Amplitude

Question 24

the process of the radio waves being reflected is referred to as

Answer 24

Radio Propagation