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AM carrier waves have relatively low frequencies they can travel quite a distance why?
Wiki User
∙ 15y ago
They are reflected round the curve of the Earth off layers in the atmosphere which act as mirrors (the ionosphere).
Wiki User
∙ 15y ago
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Does AM radio travel through the ionosphere?
Any Amplitude Modulated radio signal will penetrate the ionosphere if its carrier frequency is high enough. Signals in the commercial AM broadcast band, with frequencies between 530 and 1700 KHz, aren't high enough. Most of their energy reflects from the ionosphere.
Do all frequencies of sound travel faster in warm air than in cool air?
Frequencies of sound should travel faster in cold air because it is more dense than warm air. Sound propagates much faster through water than air for the same reason.
What is the measurement of distance over time?
(a distance traveled) divided by (time to travel the distance) is known as a "speed" .
Is it possible to displacement to be greater than distance?
Not possible. The displacement could be equal to the distance traveled ... if the route of travel was a straight line ... or less than the distance traveled ... if the route of travel was wavy and wiggly. But you can never wind up farther from your starting point than the distance you travel.
Can sound waves travel through a building?
Yes, how much gets through depends on the material, thickness of walls and objects inside, and the frequency of the sound. The sound will 'attenuate' or decrease in intensity as it travels. That is because the sound changes the form of energy that it is in to heat, motion, etc. Low frequencies will travel much farther than higher frequencies.
Does frequency reduces when the waves travel over long distance?
High frequencies are more damped by air than the bass frequencies.
IF the frequency is maximum then the signal will far awy or near?
higher frequencies attenuate more the further distance they travel.
What is the plural of frequency?
The plural of frequency is frequencies. As in "radio waves travel on different frequencies".
Why ground wave communication cannot be used for long distance using high frequency?
Frequencies over 30 Mhz normally travel through the ionosphere, whereas frequencies under 30 Mhz will normally bounce off the ionosphere, and back to earth.
What period of time in roman history was it safe to travel on roman roads?
During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.During the Pax Romana it was relatively safe to travel on Roman roads.
Why do low frequency waves travel longer distances?
High frequencies are more damped by air than low frequencies.
Why do higher sound frequencies travel better at night?
Because at night the sun goes down, which is a good thing for frequencies, because the sun is giving of radiation which is disrupting the frequencies. so at night nothing is disrupting the frequencies.
What speed can you travel with a Thule 1600 cartop carrier?
A person should be able to travel the posted speed limit with a Thule 1600 car top carrier. This is assuming the car top carrier is mounted to the car properly.
Do cells phones interfer with wireless microphones?
All communication systems use electromagentic waves which by the law of Superposition of Waves travel independently in any meadium and hence do not interfere but if the frequencies tend to match then the carrier waves with amplitude modulation are more affected and give poor quality sound at the receiving end than the frequency modulated carrier waves.
Does AM radio travel through the ionosphere?
Any Amplitude Modulated radio signal will penetrate the ionosphere if its carrier frequency is high enough. Signals in the commercial AM broadcast band, with frequencies between 530 and 1700 KHz, aren't high enough. Most of their energy reflects from the ionosphere.
What are the advantages of larger radio frequencies over smaller ones?
easier to transmit, higher frequencies radiate better. there is more bandwidth available at higher frequencies. higher frequencies travel in straighter lines so are more directional, this may or may not be an advantage depending on what is needed
Does pitch of sound change underwater?
No, the pitch (frequency) does not change, but its speed is much greater* because you are using a totally different medium to transmit the sound, some frequencies can carry farther under water than they do in the air and other frequencies (the high frequencies) can't go as far in water. Sound is a wave the lower the wave the farther it can travel, the higher the wave the shorter distance it can go before it loses it's energy by the dampening effect of the medium. ' ++++ *Mean sound speed in air: 340m/s. In sea-water, about 1500m/s. ' The higher the frequency the greater the damping attenuation, on top of the frequency-independent square-law attenuation by distance anyway, in any medium.
