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1,500 meters per second

How far does sound travel underwater?

The question should not be how far does sound travel underwater, but how fast. The speed of sound in water is about 1,484 m/s. This is 4 times faster than in air where sound travels at 343 m/s. Can sound travel underwater? Does sound travel underwater?

Why does sound travel faster in water than air?

Sound moves at a faster speed in water (1500 meters/sec) than in air (about 340 meters/sec) because the mechanical properties of water differ from air. Temperature also affects the speed of sound (e.g. sound travels faster in warm water than in cold water) and is very influential in some parts of the ocean.

What is the speed of sound in water?

Sound waves tend to travel faster at higher temperatures. I found different values ??for the speed of sound in water in different sources. They range from 1450 to 1498 meters per second in distilled water and 1531 m/s in sea water at room temperature (20 to 25C). Can you hear a sound in the water?

How do sound waves travel so far?

The channeling of sound waves allows sound to travel thousands of miles without the signal losing considerable energy. In fact, hydrophones, or underwater microphones, if placed at the proper depth, can pick up whale songs and manmade noises from many kilometers away.

What is the area in the ocean where sound waves refract up and down?

The area in the ocean where sound waves refract up and down is known as the "sound channel.". The channeling of sound waves allows sound to travel thousands of miles without the signal losing considerable energy. In fact, hydrophones, or underwater microphones, if placed at the proper depth, can pick up whale songs and manmade noises …

How do whales make sound waves?

As the whale’s sound waves travel through the water, their speed decreases with increasing depth (as the temperature drops), causing the sound waves to refract downward.

What determines how far sound travels in the ocean?

Water temperature and pressure determine how far sound travels in the ocean.

What is the thermocline?

The thermocline is a region characterized by rapid change in temperature and pressure which occurs at different depths around the world. Below the thermocline "layer," the temperature remains constant, but pressure continues to increase.

Does the temperature of the ocean increase as the depth of the ocean increases?

While pressure continues to increase as ocean depth increases, the temperature of the ocean only decreases up to a certain point , after which it remains relatively stable. These factors have a curious effect on how (and how far) sound waves travel.

What is Sound?

Ocean acoustics is the study of sound and its behavior in the sea. When underwater objects vibrate, they create sound-pressure waves that alternately compress and decompress the water molecules as the sound wave travels through the sea. Sound waves radiate in all directions away from the source like ripples on the surface of a pond. The compressions and decompressions associated with sound waves are detected as changes in pressure by the structures in our ears and most man-made sound receptors such as a hydrophone, or underwater microphone.

What is decibel scale?

Click image for larger view. The decibel scale is a logarithmic scale used to measure the amplitude of a sound. If the amplitude of a sound is increased in a series of equal steps, the loudness of the sound will increase in steps which are perceived as successively smaller.

How do hydrophones measure sound pressure?

Note on Acoustic Noise Level Units: Hydrophones measure sound pressure, normally expressed in units of micropascals (µPa). Early acousticians working with sound in air, realized that human ears perceive differences in sound on a logarithmic scale, so the convention of using a relative logarithmic scale (dB) was adopted. In order to be useful, the sound levels need to be referenced to some standard pressure at a standard distance. The reference level used in air (20µPa @ 1m) was selected to match human hearing sensitivity. A different reference level is used for underwater sound (1µPa @ 1m). Because of these differences in reference standards, noise levels cited in air do NOT equal underwater levels. To compare noise levels in water to noise levels in air, one must subtract 26 dB from the noise level referenced in water. For example, a supertanker radiating noise at 190 dB (re 1µPa @ 1m) has an equivalent noise level in air of about 128 dB (re 20µPa @ 1m). These numbers are approximate, and amplitude often varies with frequency.

What does decibel mean in a yard?

A decibel doesn’t really represent a unit of measure like a yard or meter, but instead a pressure value in decibels expresses a ratio between the measured pressure and a reference pressure. On the decibel scale, everything refers to power, which is amplitude squared.

What are the components of sound waves?

The basic components of a sound wave are frequency, wavelength and amplitude.

What is the distance between two peaks of a sound wave?

Wavelength is the distance between two peaks of a sound wave. It is related to frequency because the lower the frequency of the wave, the longer the wavelength.

What is the frequency of a sound wave?

Humans generally hear sound waves whose frequencies are between 20 and 20,000 Hz. Below 20 Hz, sounds are referred to as infrasonic, and above 20,000 Hz as ultrasonic. The frequency of middle “C” on a piano is 246 Hz. Wavelength is the distance between two peaks of a sound wave.