Understanding Sonoluminescence: Light Emission from Bubbles

Sonoluminescence

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Context:

Sonoluminescence is a fascinating phenomenon where bubbles in a liquid emit light when subjected to intense sound waves.

About:

Sonoluminescence refers to the phenomenon of producing light through the irradiation of liquids with ultrasonic waves, resulting from the interaction of bubbles formed by cavitation.

There are two types of sonoluminescence:

Multiple-bubble sonoluminescence (MBSL)

Single-bubble sonoluminescence (SBSL)

Discovery	First observed in 1934 by two German engineers studying sonar, which is similar to how bats use sound waves for navigation.
How it Works	Sound Wave Interaction: A trapped bubble in a liquid is subjected to powerful sound waves, causing it to rapidly expand and contract. Extreme Conditions: During contraction, the bubble’s temperature spikes to several thousand kelvins, ionizing the gases inside and emitting light for a trillionth of a second.
Natural Occurrence	Pistol Shrimp: In nature, the pistol shrimp (*family Alpheidae)* snaps its claw to create a high-velocity water jet, forming a bubble that collapses with a loud sound, intense heat, and a brief flash of light.
Applications	Scientific Curiosity: The mysterious nature of sonoluminescence continues to intrigue scientists and holds potential for future applications.

Source : https://www.thehindu.com/sci-tech/science/what-is-sonoluminescence/article68565026.ece#:~:text=When%20two%20German%20engineers%20were,produce%20a%20flash%20of%20light.

PRACTICE QUESTION

Q. With reference to the Sonoluminescence, consider the following statements:

It is observed when a gas bubble in a liquid is exposed to intense sound waves, causing rapid expansion and contraction.
The temperature inside the bubble during Sonoluminescence can rise to several thousand kelvins.

Which of the above-given statements is/are correct?

A. 1 only

B. 2 only

C. Both 1 and 2

D. Neither 1 nor 2

Answer: C