Sound In Vacuum: Why Can't We Hear In Space?

It is commonly understood that sound cannot travel through a vacuum, as sound waves require particles to travel through, whether it be air, water, or another medium. However, recent research has demonstrated that sound can, in fact, be transmitted through a vacuum under specific circumstances. This transmission, or tunneling, of sound waves has been achieved over extremely small distances between two crystals in a vacuum. This discovery challenges the notion that in space, no one can hear you scream, as popularized by the film Alien. While the concept of sound traveling in a vacuum may seem intriguing, it is important to note that it is limited to very specific conditions and short distances.

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Sound waves require particles to travel through

Sound waves are vibrations that travel through a medium, such as air or water, from a source to a receiver. In a vacuum, where there is no matter or medium, sound waves cannot travel as there are no particles to vibrate.

This is why the iconic tagline from the 1979 sci-fi film "Alien" states that "in space, no one can hear you scream." However, recent research has shown that sound waves can be transmitted across a vacuum under specific circumstances.

In August 2023, physicists from the University of Jyväskylä in Finland demonstrated that sound waves could be transmitted through a vacuum via an electromagnetic effect. This phenomenon, known as "tunneling," occurs when sound waves travel between two piezoelectric crystals. Piezoelectric materials, such as zinc oxide crystals, produce an electrical charge when a force or heat is applied to them. When sound is applied to one of these crystals, it creates an electrical charge that disrupts the nearby electric fields. If the crystal shares an electric field with another crystal, the disruption can travel from one crystal to the other across the vacuum.

It is important to note that this "tunneling" effect is limited to extremely small distances, smaller than the wavelength of the sound wave. Additionally, the sound waves may be distorted as they travel via this electric field. Nevertheless, this research challenges the traditional understanding of sound transmission and opens up new possibilities for exploring the nature of sound and its interaction with different mediums.

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Sound waves can be transmitted through a vacuum over small distances

It is commonly understood that sound waves cannot travel through a vacuum because there are no particles to vibrate. However, recent research has shown that sound waves can be transmitted through a vacuum over extremely small distances under specific conditions.

In August 2023, physicists Zhuoran Geng and Ilari Maasilta from the Nanoscience Center at the University of Jyväskylä in Finland demonstrated that sound waves could "tunnel" through a vacuum between two piezoelectric crystals. Piezoelectric materials, such as zinc oxide crystals, produce an electrical charge when sound is applied to them. This electrical charge creates a magnetic disruption that can be transmitted to another crystal sharing the same electric field, thus transmitting the sound across the vacuum.

This method of sound transmission is limited to distances smaller than the wavelength of a single sound wave. As frequencies increase, the gap between the crystals must be reduced. The phenomenon works across various frequencies, including audio, ultrasound, and hypersound ranges, as long as the vacuum gap is adjusted accordingly.

While this discovery challenges the notion of space as a silent vacuum, it is important to note that the "tunneling" effect is relatively small and may not have widespread applications. Additionally, the sound waves can sometimes be distorted during their journey through the vacuum. Nevertheless, this breakthrough could have implications in fields such as microelectromechanical components and smartphone technology.

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Sound energy can be transformed into heat

Sound requires a medium to travel through, and it cannot propagate in a vacuum. This is because sound is a mechanical wave that relies on the vibration of particles to transmit energy. In a vacuum, where there are no particles to vibrate and propagate these waves, sound cannot travel. This is why, in the absence of an atmosphere, such as in the vast majority of space, sound cannot be heard. Now, let's discuss the conversion of sound energy into heat:

Sound Energy and Heat Energy:

Sound energy is indeed capable of transforming into heat energy, and this phenomenon occurs through a process called thermal relaxation. When sound waves travel through a medium, such as air or any solid object, they cause the particles in the medium to vibrate. These vibrations represent the sound energy being transmitted. However, as the sound wave travels, the particles don't simply vibrate in perfect unison; they also move slightly in response to the pressure changes induced by the sound wave. This movement results in a tiny amount of disordered motion, or heat, in the medium.

In other words, some of the organized, or coherent, motion of the sound wave gets converted into random, incoherent motion of the particles. This disordered motion is what we refer to as heat. The process of thermal relaxation describes how sound energy, which is initially in the form of organized particle motion, eventually becomes dispersed as heat energy throughout the medium. This transformation occurs more rapidly in solids than in gases because solids possess greater particle density, allowing for more frequent particle collisions that expedite the equalization of energy.

Everyday Examples:

One common example of sound energy transforming into heat energy is the operation of a loudspeaker. When an audio system is played at high volumes, a significant amount of the electrical energy powering the speaker is converted into sound energy. However, due to the inefficiency of the speaker and the resistance in the coil, some of this sound energy is further transformed into heat energy, which can be felt if you place your hand on the speaker after prolonged use. This heat is generated by the friction resulting from the vibration of the speaker's diaphragm and the resistance in the electrical components.

Another example is the use of ultrasonic welding, a common industrial process for joining two plastic parts. High-frequency sound waves are applied to the interface between the two parts, creating intense local heat that melts the plastic along the joint, fusing the parts together. In this case, the sound energy is directly and purposefully transformed into heat energy to achieve a specific task.

In summary, sound energy can be partially converted into heat energy through the process of thermal relaxation, which is more rapid in solids than in gases. This conversion occurs due to the disordered motion of particles that the sound wave induces as it travels through a medium. While this conversion is often inefficient and undesirable, such as in the case of loudspeakers, it can also be harnessed for specific applications like ultrasonic welding.

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Sound waves can be transmitted through zinc oxide crystals

Sound waves are unable to travel through a vacuum because there are no particles to vibrate. However, scientists have recently discovered a way to transmit sound waves through a vacuum, but only across extremely small distances. This method involves the use of two crystals, specifically zinc oxide crystals, which are piezoelectric materials.

Piezoelectric materials, such as zinc oxide crystals, produce an electrical charge when subjected to force or heat. When sound is applied to one of these crystals, it creates an electrical charge that disrupts the nearby electric fields. If another crystal shares this electric field, the disruption can travel to it across a vacuum. The disruptions mirror the frequency of the sound waves, allowing the receiving crystal to turn the disruption back into sound.

This method of transmitting sound waves across a vacuum is not always reliable. In many experiments, the sound wave was not perfectly transmitted, with parts of the wave being warped or reflected as it passed through the electric field. However, in some cases, the entire sound wave was transmitted perfectly, with 100% efficiency and no reflections.

The distance between the two crystals cannot be larger than the wavelength of the sound wave itself. This limitation means that the sound waves can only be transmitted across very small distances.

This discovery challenges the long-held belief that "in space, no one can hear you scream", as exemplified by the tagline of the 1979 sci-fi film "Alien". While it is true that sound waves cannot travel through the vacuum of space, this new method of transmission through zinc oxide crystals demonstrates that sound can, in fact, be transmitted across small distances in a vacuum.

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Sound waves can be transmitted through piezoelectric materials

Sound waves cannot travel through a vacuum because there are no particles to vibrate. However, scientists have recently discovered that sound waves can be transmitted across small distances in a vacuum when piezoelectric materials are involved.

Piezoelectric materials, such as zinc oxide and lead zirconate titanate crystals, produce an electrical charge when force or heat is applied to them. This property is known as the piezoelectric effect. When sound waves are applied to one of these crystals, they create an electrical charge that disrupts nearby electric fields. If there is another crystal nearby that shares the same electric field, the disruption can travel to it across a vacuum. The receiving crystal can then convert the disruption back into a sound wave.

This phenomenon, known as "tunneling," has been demonstrated by physicists Zhuoran Geng and Ilari Maasilta from the Nanoscience Center at the University of Jyväskylä, Finland. They showed that sound waves could fully tunnel across a vacuum gap between two piezoelectric solids. The size of the gap must be smaller than the wavelength of the sound wave for this to work.

The discovery of sound transmission through a vacuum has potential applications in various fields. For example, it could be used in microelectromechanical components, smartphone technology, and heat control. Additionally, piezoelectric materials have been used in ultrasound production, sonar, and medical imaging. They are also used in everyday devices such as smartphones, alarm clocks, and electric cigarette lighters.

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