Sound Waves

You can use sonic weapons against a crowd but not against specific individuals, because sound tends to spread out over a wide area. Also, while you can certainly make sounds loud enough to annoy people or even to cause hearing loss, it is difficult (although not impossible) to make sounds loud enough to kill people. You may not want to kill people, of course, but in the case of weapons you usually do want to at least have that option.

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.

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.

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

They're both wave. They both carry energy.

The amplitude of a sound corresponds to its loudness so an increase in amplitude will correspond to a louder sound.

your mum carries them under her chins and deposits them next to your ear while she has a cheeky lick at the same time.

A beam of sunlight falling on a prism refracts and forms seven color bands. This illustrates that

A)

B)

C)

D)

sound waves can only travel through particles as particles vibrate. this is why solids let sound pass easiest as the vibrations are passed on the easiest. in a vacuum there is no sound because there are no particles

Sound itself is a wave. Your brain is able to process this wave as sound as it vibrates across your eardrum. The frequency and amplitude of this wave determines how you hear it (what it sounds like), or whether or not you even hear it at all.

they dig a long hole in the ground and find it

By shock waves synapsing through ears and turtles in an ocean communicating through the balls of your body

I think you mean pitch.

We communicate using sound waves by talking and listening to one another!

The result of a reflected sound wave is obviously an echo.

The sounds reflect off of other surfaces. Usually the reflective sounds will create an illusion that they are coming from every direction. That's why city ambulances running lights/sirens often get in accidents, is drivers don't know where they are coming from and don't yield. Sirens are really loud...

An Echo-echo-echo-echo! The answer is Echo

The idea is that our ears have organs which are specifically designed to detect those vibrations. Note that only vibrations between about 20 and 20,000 hertz (i.e., cycles per second) can be detected by human ears.