can they go through anything like walls?
im just wondering because how can something i cant even see get into my car and play music out my speakers.
do they travel in all directions? up down straight left right?
sorry just curious
thanks 10 points
im just wondering because how can something i cant even see get into my car and play music out my speakers.
do they travel in all directions? up down straight left right?
sorry just curious
thanks 10 points
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They are the same "stuff" as light, and have absolutely nothing to do with the waves of sound.
In general, light and its cousins are referred to by the term "electromagnetic waves" (I'll say "EM waves" for short). The essential difference between any of the spectral bands is the frequency of the wave (how "often" the wave repeats).
The main frequency of radio waves are used as the name of the station, so these should be familiar to you. The FM radio stations broadcast that number of Megahertz, and the AM radio stations broadcast that number of kilohertz.
Much like a red piece of glass is selectively transparent to different frequencies of light, so are all objects selectively transparent to different frequencies of the whole spectrum of EM waves.
Generally, the lower in frequency the EM wave, the more transparent all common objects are to it. That is why radio waves can pass through walls yet light waves cannot, even though they are the same "stuff".
In the case of the car, the antenna that receives the waves (and translates them into electric current signals) is intentionally placed outside, for better reception. The electronic circuits of the radio equipment then take its electric signals, select a certain frequency to amplify, demodulate the signal, and then send it to a speaker to convert it to sound.
Broadcast antennas in general have a spherical symmetric emission pattern (meaning in all directions equally), although in reality it will vary. In fact, modern radio broadcast antennas are specifically designed to be better at emitting in horizontal directions than in vertical directions, so that the signal power is greater where needed the most.
In general, light and its cousins are referred to by the term "electromagnetic waves" (I'll say "EM waves" for short). The essential difference between any of the spectral bands is the frequency of the wave (how "often" the wave repeats).
The main frequency of radio waves are used as the name of the station, so these should be familiar to you. The FM radio stations broadcast that number of Megahertz, and the AM radio stations broadcast that number of kilohertz.
Much like a red piece of glass is selectively transparent to different frequencies of light, so are all objects selectively transparent to different frequencies of the whole spectrum of EM waves.
Generally, the lower in frequency the EM wave, the more transparent all common objects are to it. That is why radio waves can pass through walls yet light waves cannot, even though they are the same "stuff".
In the case of the car, the antenna that receives the waves (and translates them into electric current signals) is intentionally placed outside, for better reception. The electronic circuits of the radio equipment then take its electric signals, select a certain frequency to amplify, demodulate the signal, and then send it to a speaker to convert it to sound.
Broadcast antennas in general have a spherical symmetric emission pattern (meaning in all directions equally), although in reality it will vary. In fact, modern radio broadcast antennas are specifically designed to be better at emitting in horizontal directions than in vertical directions, so that the signal power is greater where needed the most.
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well yeah waves can go though walls ex: when you can hear msuic (sound waves) from your neighboors house
likewise, radio signals transmitted from towers can go through preeety much anything, they also transmit throughout cities and diffrract from tall points in towers
and as for the last question, yes they can travel in all dirrection, but it can sometimes depend on the direction they are transmited and direction the tranmitter intended it to propagate
likewise, radio signals transmitted from towers can go through preeety much anything, they also transmit throughout cities and diffrract from tall points in towers
and as for the last question, yes they can travel in all dirrection, but it can sometimes depend on the direction they are transmited and direction the tranmitter intended it to propagate