Speed of Sound

A loudspeaker uses electromagnets. An electromagnet consists of an iron centre which has coils of wire tightly wrapped round it. This is known as a solenoid. When the current flows through the wires of the solenoid it produces a magnetic field round it. the iron core increases the strength of the magnetic field. A solenoid can behave like a normal bar magnet, with a north and south pole. Which is north and which south depends on the way the electricity goes through. When the electricity stops, the magnetism stops too. Electromagnets are useful because their magnetism can be turned on and off by turning the electricity supply on and off.

To understand how a loudspeaker works, it is best to start with a microphone. A microphone turns sound into electricity. A microphone has grains of carbon behind a disc. Wire carrying electricity is connected to the carbon. When someone speaks into a microphone, this makes sound waves, which make the disc tremble. When the disc trembles, it pushes the grains of carbon in and out slightly. This movement affects the strength of the electricity in the wire. Loud noises move the disc most and cause the biggest change in electricity. Soft sound hardly move the disc at all and cause only a weak change. Speaking into a microphone sends a changing electric current along its wire. Earphones turn the changing electric current back into sound waves. There is an electromagnet in the earphone which has a metal disc in front of it. Different strengths of electricity make the magnetism weaker or stronger. the changes in magnetic strength make the disc tremble, which makes sound waves in the air. These are an exact copy of the sound waves that went into the microphone, and so an exact copy of the sound is heard.

In the case of loudspeakers, the sound waves can be made extra clear by joining the metal disc to a cone of cardboard. The whole cone trembles when the disc does. This moves more air and makes clearer and louder sound waves. Radios, cassette and CD players all have loudspeakers inside them.

Airplanes experienced a phenomenon called "Mach tuck," where the nose would pitch downward. This made it challenging for pilots to control the aircraft and posed a significant safety risk.

The first flight at faster than the speed of sound occurred on 14 October 1947. The aircraft was the Bell X-1 and the pilot was Captain Charles Yeager.

Yes, the state of a medium, such as its temperature and density, can affect the speed of sound passing through it. In general, sound travels faster in materials that are more rigid or dense, like solids, compared to gases or liquids. The speed of sound in a medium is also influenced by factors like pressure and composition.

Yes. That's what Mach numbers are all about. Mach numbers compare the sound of something moving through air to the speed of sound moving in that same air. Note that the speed of sound in air will vary a bit as the temperature, humidity and a couple of other things vary. In general, though, it's about 770 miles per hour (dry air at 20 °C (68 °F). A link is provided to the Wikipedia article on the speed of sound.

The speed of sound in air increases with temperature. At 0°C, the speed of sound in air is about 331 m/s, while at 20°C it is around 343 m/s. This is due to the increase in the average speed of air molecules at higher temperatures, which allows sound waves to travel faster.

Yes, waves can carry momentum. This can be seen in phenomena like the transfer of momentum from ocean waves to surfers or in the pressure exerted by sound waves on a surface.

In general, pulse width does not directly affect wave speed. The speed of a wave is determined by the medium through which it is propagating and the properties of that medium, rather than the pulse width itself. However, in practical applications, a shorter pulse width may allow for a higher data transmission rate in communication systems, which can indirectly impact the speed of information transfer.

The speed of sound in air at room temperature (approx. 20°C or 68°F) is about 1,125 ft/s. The speed of sound increases with temperature in the air, so for higher temperatures, like 30°C (86°F), the speed of sound would be slightly higher.

The speed of sound through foam can vary depending on the density and composition of the foam. On average, the speed of sound through foam is around 100-200 meters per second, which is slower than the speed of sound in air.

Sound travels faster through air than through cotton wool. In air, sound travels at a speed of approximately 343 meters per second, while in cotton wool it would travel at a slower speed due to the material's denser and more absorbent nature.

The Young's modulus (E) for ice is 9.1 GPa. The density of ice (rho) is 916 kg/m^3. Speed of sound for longitudinal rather than transversal sound waves (c) is given by the equation: c = sqrt(E/rho) Therefore the speed of sound in ice = sqrt((9.1*10^9)/(9.16*10^5)) which is approximately 3152 m/s

End correction occurs in measurements due to the physical dimensions of the measuring instrument or device. The end correction accounts for the fact that the measuring point is located at some distance from the end of the instrument, requiring an adjustment to ensure accurate measurements. This correction is necessary in various fields, such as acoustics, fluid mechanics, and metrology, to ensure precision in calculations and results.

Knocking on a door is a common social norm to announce your presence before entering someone's personal space. It allows the person inside to have time to prepare or adjust before you enter, showing respect for their privacy and personal boundaries. Calling out may not provide the same level of courtesy and can be perceived as intrusive.

You can protect the galvanometer against large-scale out-of-balance conditions by installing overload protection devices like fuses or current limiters in the circuit. You can also use damping techniques to prevent the galvanometer needle from swinging too wildly when an imbalance occurs. Regular maintenance and calibration checks can help identify and address any potential issues before they cause damage to the galvanometer.

To determine if the resistors lie within the tolerance limits, you need to compare the measured resistance values of the resistors with the specified range provided by the tolerance. If the measured resistance values fall within this specified range, then the resistors are within tolerance limits.

Logarithms are used to express sound intensity because sound intensity can vary over many orders of magnitude. Using logarithms allows for a more manageable scale to represent these variations. Additionally, our perception of sound intensity is more closely related to the logarithm of the actual physical intensity of sound waves.

The speed of sound in air at 30C is approximately 349 m/s. To calculate the time it takes for sound to travel 33.1 m, you divide the distance by the speed of sound: 33.1 m / 349 m/s ≈ 0.095 seconds.

The speed of sound in air at 20C is approximately 343 meters per second. To find the time it takes for sound to travel 33.6 meters, you divide the distance by the speed: 33.6 meters / 343 m/s ≈ 0.098 seconds.

The speed of sound is approximately 343 meters per second (at standard conditions). There is no direct conversion from speed of sound to rpm (revolutions per minute), as rpm is a measure of rotational speed, while the speed of sound is a measure of how quickly sound waves travel through a medium like air.

The speed of sound can be determined using the method of echoes by measuring the time it takes for a sound wave to travel to a reflective surface and back. By dividing the total distance traveled by the time taken, one can calculate the speed of sound as twice the distance divided by the time taken. This method is commonly used in environments where direct sound measurements are difficult, such as in large open spaces or underwater.

KTS stands for knots and it is a unit used to measure airspeed. One knot is equal to one nautical mile per hour. So, when you see airspeed measured in knots (kts), it is referring to the speed of an aircraft relative to the air.