What is a radio wave ?

What is a radio wave ?
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1 Answer

Answer :

Radio waves are a type of electromagnetic radiation that has a range of wavelengths. Extends from millimeters to 100 kilometers.
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Description : What is the Data Transmission Speed of Radio Wave ?

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Description : What is FM Radio ?

Last Answer : FM Radio The most popular radio of today. The full form of FM is the frequency module. It broadcasts at 8-106 MHz. Radio can be heard very clearly in FM technology .

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Description : How many types of radio waves ?

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With which can Radio wave of constant amplitude be generated? -Do You Know?

Description : With which can Radio wave of constant amplitude be generated? -Do You Know?

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Long distance short-wave radio broad casting uses which waves? -Do You Know?

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Last Answer : answer:

How long is a typical radio wave which has a frequency of 560 kilometers?

Description : How long is a typical radio wave which has a frequency of 560 kilometers?

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Why are we able to hear shortwave broadcasts better than long wave broadcasts? (a) Short wave broadcasts are made by nearby radio stations (b) Short waves are unaffected by atmospheric disturbances (c) Short waves are more energetic than long waves (d) By convention, short waves are meant for long distances whereas long waves are reserved for short distances

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Last Answer : Ans:(c) Direction: In the following question, a statement of Assertion (A) is given followed by corresponding Reason (R), just below it. Read the statements carefully and mark the correct answer: (a) If both A and ... true but R is not the correct explanation of A. (c) If A is true but R is false

Why are we able to hear short wave broadcasts better than long wave broadcasts? (1) Short waves are more energetic than long waves (2) Short waves are unaffected by atmospheric disturbances (3) Short wave broadcasts are made by nearby radio stations (4) By convention, short waves are meant for long distances, whereas long waves are reserved for short distances

Description : Why are we able to hear short wave broadcasts better than long wave broadcasts? (1) Short waves are more energetic than long waves (2) Short waves are unaffected by atmospheric disturbances ... convention, short waves are meant for long distances, whereas long waves are reserved for short distances

Last Answer : (1) Short waves are more energetic than long waves Explanation: Shortwave radio is used for broadcasting of voice and music, and longdistance communication to ships and aircraft, or to remote areas ... wired communication or other radio services and that's why it is more energetic than long waves.

Decibel is the unit used for – (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency

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For a space wave transmission, the radio horizon distance of a receiving antenna with a height of 64 meters is approximately A. 8 km B. 32 km C. 64 km D. 256 km

Description : For a space wave transmission, the radio horizon distance of a receiving antenna with a height of 64 meters is approximately A. 8 km B. 32 km C. 64 km D. 256 km

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Which of the following phenomena is possible is free space medium? A. Reflection of radio wave B. Diffraction of radio wave C. Refraction of radio wave D. Attenuation of radio wave

Description : Which of the following phenomena is possible is free space medium? A. Reflection of radio wave B. Diffraction of radio wave C. Refraction of radio wave D. Attenuation of radio wave

Last Answer : D. Attenuation of radio wave

____ is defined as any radiation of energy by means of electromagnetic wave. A. Emission B. Radiation C. Radio D. Broadcasting

Description : ____ is defined as any radiation of energy by means of electromagnetic wave. A. Emission B. Radiation C. Radio D. Broadcasting

Last Answer : A. Emission

What device measures the angle between two radio frequencies and also the direction of propagation of a wave? A. Densimeter B. Absorption wavemeter C. Goniometer D. Ergometer

Description : What device measures the angle between two radio frequencies and also the direction of propagation of a wave? A. Densimeter B. Absorption wavemeter C. Goniometer D. Ergometer

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What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. C. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station D. A fading effect caused by time differences between the receiving and transmitting stations.

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Last Answer : B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Most AM broadcasts employ ___ polarization while most FM broadcasts employ ___ polarization of the radio wave. A. vertical, vertical B. vertical, horizontal C. horizontal, vertical D. horizontal, horizontal

Description : Most AM broadcasts employ ___ polarization while most FM broadcasts employ ___ polarization of the radio wave. A. vertical, vertical B. vertical, horizontal C. horizontal, vertical D. horizontal, horizontal

Last Answer : B. vertical, horizontal

The polarization of a radio wave: A. Is perpendicular to the electrostatic field of the antenna B. Is the same direction as the electrostatic field of the antenna. C. Is the same direction as the magnetic field of the antenna. D. Is perpendicular to both the electrostatic and magnetic fields of the antenna.

Description : The polarization of a radio wave: A. Is perpendicular to the electrostatic field of the antenna B. Is the same direction as the electrostatic field of the antenna. C. Is the same direction ... field of the antenna. D. Is perpendicular to both the electrostatic and magnetic fields of the antenna.

Last Answer : B. Is the same direction as the electrostatic field of the antenna.

What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

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Last Answer : D. A frequency modulated continuous wave

Which of the following is not one of the natural ways a radio wave may travel from transmitter to receiver? A. Ground wave B. Micro wave C. Sky wave D. Space wave

Description : Which of the following is not one of the natural ways a radio wave may travel from transmitter to receiver? A. Ground wave B. Micro wave C. Sky wave D. Space wave

Last Answer : B. Micro wave

For a space wave transmission, the radio horizon distance of a transmitting antenna with a height of 100 meters is approximately:A. 10 km B. 40 km C. 100 km D. 400 km

Description : For a space wave transmission, the radio horizon distance of a transmitting antenna with a height of 100 meters is approximately: A. 10 km B. 40 km C. 100 km D. 400 km

Last Answer : B. 40 km

What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the receiving station. C. Time differences between the receiving and transmitting stations. D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Description : What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the ... Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Last Answer : D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Which of the following parts of the radio receiver represent the component that extracts the desire RF signal from the electromagnetic wave? A. AF amplifier B. Antenna C. Detector D. Crystal

Description : Which of the following parts of the radio receiver represent the component that extracts the desire RF signal from the electromagnetic wave? A. AF amplifier B. Antenna C. Detector D. Crystal

Last Answer : B. Antenna

Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading effect caused by small changes in beam heading at the receiving station. C. A fading effect caused by the time differences between the receiving and transmitting stations. D. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Description : Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading ... caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Last Answer : A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

With which can Radio wave of constant amplitude be generated?

Description : With which can Radio wave of constant amplitude be generated?

Last Answer : Oscillator

Long distance short-wave radio broad casting uses which waves?

Description : Long distance short-wave radio broad casting uses which waves?

Last Answer : Ionospheric wave

Radio wave concentration in the direction of the signal emitted by a directional antenna. A. Back lobe radiation B. Side lobe radiation C. Major lobe radiation D. Transmitted signal

Description : Radio wave concentration in the direction of the signal emitted by a directional antenna. A. Back lobe radiation B. Side lobe radiation C. Major lobe radiation D. Transmitted signal

Last Answer : C. Major lobe radiation

kilohertz (kHz) is a unit which measures? A. Power used by a current of one ampere B. Electromagnetic radio wave frequencies (Answer) C. Voltage D. Electric resistance

Description : kilohertz (kHz) is a unit which measures? A. Power used by a current of one ampere B. Electromagnetic radio wave frequencies (Answer) C. Voltage D. Electric resistance

Last Answer : B. Electromagnetic radio wave frequencies (Answer)

What happens to the radio wave if the luf is too low?

Description : What happens to the radio wave if the luf is too low?

Last Answer : When luf is too low it is absorbed and is too weak for reception.

What is the skip zone of a radio wave?

Description : What is the skip zone of a radio wave?

Last Answer : A zone of silence between the ground wave and sky wave where there is no reception.

What factor determines whether a radio wave is reflected or refracted by the ionosphere?

Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?

Last Answer : Thickness of ionized layer.

What is the best type of surface or terrain to use for radio wave transmission?

Description : What is the best type of surface or terrain to use for radio wave transmission?

Last Answer : Radio horizon is about 1/3 farther.

What is the determining factor in classifying whether a radio wave is a ground wave or a space wave?

Description : What is the determining factor in classifying whether a radio wave is a ground wave or a space wave?

Last Answer : Whether the component of the wave is travelling along the surface or over the surface of the earth.

What is the term used to describe the basic frequency of a radio wave?

Description : What is the term used to describe the basic frequency of a radio wave?

Last Answer : Fundamental frequency.

What is the term used to describe a whole number multiple of the basic frequency of a radio wave?

Description : What is the term used to describe a whole number multiple of the basic frequency of a radio wave?

Last Answer : Harmonic frequency or harmonics.

.Light is A. an electromagnetic wave B. a form of energy visible to the human eye C. the same type of energy as an X ray D. the same type of energy as a radio wave E. all of the above

Description : .Light is A. an electromagnetic wave B. a form of energy visible to the human eye C. the same type of energy as an X ray D. the same type of energy as a radio wave E. all of the above

Last Answer : E. all of the above

What is the WAVELENGTH of the carrier wave, in meters, of a radio station which is broadcasting at a frequency of 100 megahertz?

Description : What is the WAVELENGTH of the carrier wave, in meters, of a radio station which is broadcasting at a frequency of 100 megahertz? 

Last Answer : ANSWER: 3 METERS

What is a typical wavelength of an AM radio wave? w) 3000 meters x) 300 meters y) 30 meters z) 3 meters

Description : What is a typical wavelength of an AM radio wave? w) 3000 meters x) 300 meters y) 30 meters z) 3 meters

Last Answer : ANSWER: X -- 300 METERS

Of the following, the type of wave that CANNOT be polarized is w) electromagnetic x) light y) sound z) radio

Description : Of the following, the type of wave that CANNOT be polarized is w) electromagnetic x) light y) sound z) radio

Last Answer : ANSWER: Y -- SOUND

Which wave has the highest frequency? w) microwaves x) infrared waves y) ultraviolet waves z) radio waves

Description : Which wave has the highest frequency? w) microwaves x) infrared waves y) ultraviolet waves z) radio waves

Last Answer : ANSWER: Y -- ULTRAVIOLET WAVES

The layer of atmosphere used for radio-wave transmission is (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Description : The layer of atmosphere used for radio-wave transmission is (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Last Answer : ionosphere

Decibel is the unit used for (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency

Description : Decibel is the unit used for (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency

Last Answer : Intensity of sound

Why are we able to hear short wave broadcasts better than long wave broadcasts ? (1) Short waves are more energetic than long waves. (2) Short waves are unaffected by atmospheric disturbances. (3) Short wave broadcasts are made by nearby radio stations. (4) By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

Description : Why are we able to hear short wave broadcasts better than long wave broadcasts ? (1) Short waves are more energetic than long waves. (2) Short waves are unaffected by atmospheric ... convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

Last Answer : Short waves are more energetic than long waves.

An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town

Description : An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city?  a. 36 s b. 20 us c. 20 ms d. 40 ms 

Last Answer : An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city?  a. 36 s b. 20 us c. 20 ms d. 40 ms