How to measure the speed of sound in a simple way faster, now for the answer .

Place a firecracker in an open space with an obstacle in the distance, measure the time interval t when the echo is heard, and the distance s to the obstacle with the speed of sound v=2s t

There are many ways to book the speed of sound, I can provide one, shout at a higher obstacle, record it with a stopwatch at the same time, and then hear the echo and record the sound again, measure the distance between people and obstacles, and you can calculate the speed of sound, but it is very accurate.

Don't misunderstand the "think and do" statement in "each group comes up with a way to measure the speed of sound" that each group has to be different. In fact, junior high school students can only come up with methods similar to measuring the distance from the starting point of the starting pistol to the observation location, and the time between seeing the smoke from the starting pistol and hearing the gunshot. Of course, students should also be encouraged to come up with a method similar to how to measure the speed of sound by striking a steel plate or piece of iron with a hammer, then measuring the time it takes for the hammer to fall and hearing the sound of the hammer hitting the plate, and then measuring the distance from the point of striking to the measuring point.

Answer: Method 1.

Method 1: After a sound is generated, it does not reach your ears immediately, usually after a period of time. It's hard to understand unless you have this experience yourself.

For example, if you attend a sports day and sit at a distance from the person who fired the gun, you will see the gun smoke first and hear the gunfire later. This is because light travels very fast (about 300,000 kilometers in 1 second) and sound travels much slower (about 340 meters in 1 second).

So you'll see the gun smoke right away, but the sound won't be heard until a little while. �

So the early measurement of the speed of sound was an experiment with a gun. The helper was to hold a gun at a measured distance, and the other person stood at the origin with a horse's watch. After seeing the signal, the helper fired a gun into the air.

As soon as the person at the origin saw the sparks and smoke of the gun, he pressed down the horse's watch; And when he heard the gunshots, he pressed the watch again to stop him. The time between seeing a spark and hearing a gunshot is the time it takes for the sound to travel a measured distance through that segment. You can calculate the speed of the sound.

According to this principle, you might as well try it out in the future school sports day (using the 100-meter race).

Method 2: In order to measure the speed of sound, you need a horse watch and a tape measure. Measure a distance of 500 meters and be as accurate as possible.

You and your classmates stand at opposite ends; Your classmates hold a large stone in each hand (or a gong, a drum, or simply clap their hands – the clapping is too low to be heard by the other person), and you take a horse watch. When you shout "start", your classmates should lift the stone above their heads and hit it as loud as possible. As soon as you see the stones crashing together, press the horse watch.

Wait until you hear the sound of the stone crashing, then press the watch again to stop it. In terms of time, it is necessary to record tenths of a second. It would be best if you could do a few more experiments to calculate the average of the time.

You can use a computer to divide the distance between you and your classmates by time to calculate the speed of sound.

Methods for measuring sound velocity include:

Direct method: The speed of sound is calculated by experimentally measuring the travel time and distance of sound through the air.

Resonance method: Resonance is generated in a pipe, the resonance frequency is measured, and the speed of sound is calculated from the wavelength and frequency.

Astronomical method: Calculate the speed of sound by observing the time difference of sound propagating in the atmosphere, such as observing lightning and thunder.

Merkel's method: The relationship between the resonant frequency of a cylinder and the speed of sound is used to measure the speed of sound.

Doppler effect: The Doppler effect is used to measure the speed of sound, that is, to measure the frequency change of sound waves in moving air.

Electromagnetic method: The velocity of sound is measured using the relationship between the velocity of a sound wave as it travels along a magnetic field and the velocity of an electromagnetic wave.

Similarities: Both are measured with continuous waves, both rely on an oscilloscope.

Difference: Resonance method: The sound waves propagating in parallel interfere with the reflected waves to form standing waves. Changing the propagation distance of half a wavelength, the amplitude of the standing wave changes by one period, so that the wavelength can be measured, multiplied by the frequency, and the speed of sound is obtained.

Phase method: Compare the phase difference between the relative and transmitted waves of the received wave, change the propagation path of a wavelength, and change the phase by 360 degrees, so as to view the phase diagram by measurement.

The wavelength can be measured, multiplied by the frequency, and the speed of sound can be obtained.

One of the simplest and most effective ways to measure the speed of sound is to use the basic relationship between the speed of sound v, the frequency f and the wavelength, that is, a pair of ultrasonic piezoelectric ceramic transducers with the same structure (transmitter and receiver) are used to convert the sound pressure to the voltage.

The amplitude and phase of the ultrasonic wave are observed by using an oscilloscope, the wavelength is determined by the amplitude method and the phase method, and the frequency f is directly read out by the oscilloscope.

Resonant frequency: The ultrasonic piezoelectric ceramic transducer is the key component of the experiment, each pair of ultrasonic piezoelectric ceramic transducers has its own inherent resonant frequency, when the working frequency of the transducer system is in the resonant state, the ultrasonic power emitted by the transmitter is the largest, which is the best working state.

Fundamental quantities in acoustics.

In acoustics, it is the basic quantity in acoustics that describes the characteristics of a sound source and the sound field it generates, or some quantities that play a dominant role in certain acoustic phenomena and effects. Table 1 lists these fundamentals and their interrelationships. Of the first four quantities, sound intensity is the easiest to measure and can be measured very accurately, and the other three can be derived from sound intensity, so it has been mistaken in the past that only sound intensity is the fundamental quantity in acoustics.

The above content refers to: Encyclopedia - Acoustic Measurement.

In general, light is used to help in the measurement. If a distance is selected (relatively far), light (or smoke) and sound are emitted at the target point at the same time, the timing starts when the light (or smoke) is seen at the predetermined measurement point, and the timing ends when the sound is heard, the time difference is the propagation time of the sound, and the speed of sound is obtained by dividing the known distance by this time.

Measuring tools: tape measure, horse watch, drum.

Measurement method: 1. Prepare a horse watch and a pair of tape measures for backup;

2. Use a tape measure to measure the distance of 500 meters;

3. Two people stand at both ends of the measured distance;

4. One person holds a drum and one person holds a horse watch;

5. The person holding the horse watch shouts the command "start", and the other person beats the drum in his hand;

6. When observing the action of the person beating the drum, press the horse watch to record the time, and when you hear the beating drum, you will record the time according to the date of dismounting again;

7. According to the recorded data, the speed of sound can be calculated by dividing the distance by the meter of time.