Echoes of sound and images in a mirror involves sound waves and light waves respectively being reflected off a surface.
Sound waves travel through the outer ear, middle ear, and inner ear before they reach the brain. In the outer ear, sound waves are collected by the ear canal and directed to the eardrum. Then, in the middle ear, the sound waves cause the three tiny bones (hammer, anvil, and stirrup) to vibrate. Finally, in the inner ear, the vibrations are transformed into electrical signals that are sent to the brain via the auditory nerve.
The speed of sound waves in air is approximately 343 meters per second. To calculate the time it takes for the sound waves to reach you, divide the distance by the speed. In this case, it would take approximately 116.8 seconds or about 1 minute and 57 seconds for the sound waves to reach you.
One disadvantage of sonic weapons is the potential for collateral damage. The high-intensity sound waves can affect not only the targeted individuals but also unintended bystanders, causing harm or injury. Moreover, these weapons can have long-term health effects, such as hearing loss or psychological trauma, especially if used in close proximity to people. Additionally, the use of sonic weapons can raise ethical concerns and spark public controversy regarding their intended purpose and appropriate use.
The sound wave produced by a violin is a complex waveform with multiple harmonics. It is generated by the vibration of the strings, which are then transmitted to the body of the instrument and amplified through the resonance of the hollow body. This combination of harmonics gives the violin its unique and rich tone.
The sound made by an emu can best be described as a deep-throated "drumming". They are able to fill their throat pouches with air, generating a drumming sound that can be heard several kilometres away.
vibrate at its natural frequency. WHS AOEC
Its wavelength increases and its frequency decreases
Sound waves are propagated as compression waves in air (and in other gases). They will be produced by any object vibrating at appropriate frequency. As far as humans are concerned, we can hear frequencies from about 25 HZ up to 15 kiloHz, though the upper register gets less efficient as you age. For music or speech transmission we use a loudspeaker which is some sort of diaphragm actuated by a moving coil which responds to electrical signals in this frequency range, and the diaphragm produces the compression waves simply by moving in and out. Sound waves travel at about 720 mph in air at normal temperature and pressure.
The tranducer/microphone converts the vibrations of the waves into electrical audio signals, the vibrations cause a diaphragm inside the transducer to vibrate which in turns create pulses of current that can be interpreted later as the recorded audio.
Curtains help absorb sound waves, whereas sound waves bounce off solid walls, so a curtained room will be more quiet.
Ultrasound
Moving is a relative fact: an object moving in a reference system (for example a train as observed from the station by a still observer) can be still in another reference system (for example the same train as seen by a car moving with the same velocity).
What is relevant is to accelerate (for example to start a movement in a reference where the object was still or to stop it). To accelerate a force is needed.
In empty space accelerating is essentially possible due to the so called momentum conservation law.
It states that the product of mass by velocity of an insulated system (no relation with other systems) cannot change in absence of forces.
Let us consider a car on a road: the force rotating the wheels comes from the car: it cannot directly change the car velocity. However, the contact between the wheels and the road causes a reaction from the road due to attrition. This is an external force: the car is not an insulated system and it can accelerate or stop.
In empty space this kind of propulsion is not possible.
Let us consider a rocket. Due to the action of the engine it trows out a mass (for example m1) in unit time from the jet at a speed v1.
The system before expulsion has a momentum (m+m1) v, where m is the rocket mass after the expulsion and v the rocket speed before the expulsion.
It has to be equal after the expulsion, thus, calling v2 the speed after the expulsion and considering that the mass m1 have a speed -v1 (opposite to the rocket direction) it is
(m+m1) v = m v2 -m1 v1
thus the velocity after the expulsion is v2=( (m+m1) v+m1 v1)/m > v. An acceleration has been obtained and the rocket increases its velocity :-))
The expulsion can be due to different causes, it depends on the used engine. Generally it is caused by a liquid fuel used in a turbine.
4000 Hz is wrong, since your hearing is very sensitive at a younger age. A averge 30-40 year old adult might be able to hear 5000Hz, but a teenager from 12-18 could most likely hear a 6000-6500Hz like nothing fazed them.
Sound-on-film has existed since 1927, but it has only been in a digital format since around 1992. Disney films created before then (like all other sound films) recorded the sound effects and music on analog media. It was synchronized onto the film strips using either magnetic (just like a cassette tape) or optical (usually the RCA Photophone) formats. Most 35mm films still include an RCA Photophone track, in case the theater is not equipped to run digital sound or the digital equipment fails.
The density of the medium through which it is travelling: for example, about 343m/s in air; almost 1500m/s in sea-water.
It is echolocation because just like dolphin the send high pitched squeaks to see if anything bounces off and relects back to see how far away it is. The high pitched squeakes off boats bounce off the ocean floor to see how deep it is.
- 6 dB is incorrect. It will decrease by 12 dB.
All metals can conduct sound, but some conduct it a bit better than others.
That is a difficult question. I would say that the denser the gas, the faster the speed of sound. Since the gas occupies a lot more space, sound energy/waves are transmitted more easily. :D
The amplitude of a sound corresponds to its loudness so an increase in amplitude will correspond to a louder sound.