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Most humans are incapable of hearing frequencies slower than about 20 Hz.
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What is ultrasonic wave?
An ultrasonic wave is a sound pressure wave that has a very high frequency. The frequency is higher that what humans can hear.
Difference between RF microwave?
RF means radio frequency or relativity low range of frequency microwaves however are into the top range of the spectrum or very hi frequency.
How is modulation used?
To hear a radio 100 of miles away from the source when the frequency is 1000kc it would require antenna of tremendous size and bulk. So the idea is to transmit a very hi frequency and vary that frequency by 1000kc and then get rid of the carrier frequency and hear the modulation frequency only or 1000kc in this example.
Why PLL better than VCO?
A PLL is different than a VCO. Each has its own use. Actually a PLL (Phase Locked Loop) contains a VCO (Voltage controlled oscillator). A VCO is an oscillator whose frequency is related to an input voltage. You can use it when you need a varying frequency that is controlled by a varying voltage. But it is not great at outputting a consistant exact voltage because it is very sensitive to its environment (e.g. temperature). A PLL will "lock" its output frequency to some input frequency. So it can oscillate at a frequency that is controlled by an input oscillator. Not too useful if the output frequency is the same as the input. But the output frequency can be divided before it is compared to the input. This allows the output frequency to be higher (some multiple of) the input frequency. Once a PLL is "locked on" to an input frequency it can be very stable.
What is choke coil?
A choke coil is an inductor, which is designed to block a particular frequency in an electrical circuit while passing signals of very less frequency or direct current.
How can one tuning fork's vibrations cause another tuning fork to vibrate?
Vibrations are transferred from one to the other through the air. If the two have the same frequency (or a very similar frequency), resonance will occur.
Where is the basilar membrane most sensitive to the vibrations of very high-frequency sound waves?
closest to the cochlea
What is ultrasonic wave?
An ultrasonic wave is a sound pressure wave that has a very high frequency. The frequency is higher that what humans can hear.
What is the lowest frequency humans can hear?
It varies with individuals of course, but 19-21 is very common
Can any of the three forms of radiation be seen or felt by humans?
Humans are very sensitive to physical vibrations in material media in the frequency range of 20 Hz to 20 KHz, known as 'sound'.Humans are also very sensitive to electromagnetic energy with wavelengths between roughly 350 to 800 nanometers, known as 'light'.Human skin is also sensitive to electromagnetic radiation with somewhat longer wavelengths than visible light, known as 'infrared' radiation, or 'heat'.
Are radio waves healthy for humans?
not for a long time. they are not very harmful as they have a long wavelength and a low frequency.
What irritating sound is caused by irregular vibrations?
So-called "fast vibrations" cause "high pitched" sounds. Very fast vibrations cause very high pitched sound. Slow vibrations cause low pitched sound. You get the picture. The "speed" of vibrations relates to the frequency of the sound that is produced by them.
Do humans have any sensitive bones in the ear?
There are three auditory ossicles in the middle chamber of the ear. They are very sensitive to the sound vibrations made by the tympanic membrane (eardrum).
If a sound had a high amplitude and high frequency what would it sound like?
The sound would be like thunder, since thunder also has high amplitudes and frequency also. Usually at the begining of thunder you will listen cracking (krat..kat..krat .........) sound which is high frequency and high pitch. At the time when thundering is almost stop you will listen the heavy /bass sound which is very high amplitude and low frequency (goom.goom....goom...........) sound.
What is the frequency of infared?
The frequency of infrared is less than 20Hz or 20 vibrations per second.The minimum hearing capacity of Humans is 20Hz.So we are not able to hear them.For example,Rhinoceros communicate each other with very low infrared frequency-5Hz.
What will happen if a vibrating tuning fork is placed near another tuning fork of the same frequency?
Yes. It's an effect called 'resonance' - two identical things can vibrate in synch if the vibrations of one can someone pass to the other. The usually way of doing this is to stand them both on the same surface, so that the vibration can pass through that object.
What is the frequency range of audible noise?
The answer to the question varies from species to species. In case of Humans it is 20 Hz to 20,000 Hz. But some other organisms especially animals of prey have very accute sense of hearing and they can listen to very faint and diffused sounds. For example Dogs have a very acute auditory sense and so they can discern sounds of even higher than 20,000 Hz.
