How do cicadas make sounds?

This male cicada can sing. Its vocal organ is located in the abdominal muscles, and it is covered with an eardrum like a drum. The eardrum vibrates and makes a sound. Because the vocal cord muscles can expand and contract about 65,438+0,000 times per second, and the cover plate and tympanic membrane are empty, which can play a role of * * *, so its singing is particularly loud.

And you can sing in different tones in turn. The male cicada keeps singing every day in order to lure the female cicada to mate. They can't hear their own songs.

The male cicadas of each species make three different songs: collective songs, which are regulated by daily weather changes and the songs of other male cicadas; Courtship before mating; The harsh sound made when caught or afraid to fly away.

The female cicada is a "dumb cicada" because her musical instrument structure is incomplete and she can't make a sound. Some species are easy to distinguish in singing, behavior and morphology.

Extended data

Sound is the sound wave produced by the vibration of an object. It is a wave phenomenon, which propagates through media (air or solid or liquid) and can be perceived by human or animal hearing organs. The source of the object sound that vibrates (vibrates) at first.

Sound vibrates in waves. Sound is the movement formed by sound waves propagating through any substance. As a kind of wave, the sound with frequency between 20 Hz~20 kHz can be recognized by human ears.

In physics, sound is produced by the vibration of an object, and the object that emits sound is called a sound source. The number of times an object vibrates in one second is called frequency, and the unit is hertz. People's ears can hear the sound of 20 Hz-20hz-20000Hz. The most sensitive sound is 1000Hz-3000Hz.

The propagation speed of sound in different media is generally solid >: liquid > gas (except for cork 500m/s, less than kerosene (25℃) and distilled water (25℃). ), the speed of sound propagation is related to the type of medium and the temperature of the medium.

The propagation speed of sound in various objects;

Vacuum 0m/s (i.e. unable to propagate)

Air (0℃)33 1 m/s

Air (15℃) 340m/s

Air (25℃) 346m/s

Cork 500 m/s

References:

Baidu Encyclopedia-Sound (physical terms)

References:

Baidu Encyclopedia-Cicada (Hemiptera Cicadellidae)