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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.
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.
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.
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?
The basilar membrane is most sensitive to very high-frequency sound waves near the base of the cochlea, which is the region closest to the oval window where the vibrations enter the inner ear. This region is characterized by stiff and narrow fibers, which are optimal for detecting high-frequency vibrations.
What do you call sounds with very low vibrations per second?
Sounds with very low vibrations per second are called infrasound. These low-frequency sounds are below the threshold of human hearing, typically below 20 Hz.
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
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.
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.
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'.
What is the lowest frequency of sound that most humans can hear?
Most humans can hear sound frequencies as low as 20 Hz. Below this frequency, the sound may be more felt than heard, especially at very high volume levels.
How atomic clocks work?
Atomic clocks, rather than use gears or quartz movement as a timing standard, use electromagnetic waves as timing standards. Often the transition frequency used is in the microwave spectrum. This makes them extremely accurate since they use such very small units.
Are vibrations in materials responsible for making different sounds?
Yes, vibrations in materials are responsible for making different sounds. When an object vibrates, it creates sound waves that travel through the air and reach our ears as sound. The frequency of the vibrations determines the pitch of the sound produced.
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).
