Experimental equipment:
Two kinds of flames are needed in the experiment, one as the "child" flame and the other as the "mother" flame. The sub-flame is located at the sound source and generates sound through sound wave vibration. The mother flame is located at a certain distance, and the acoustic interference phenomenon is observed.
Workflow:
The vibration of the sub-flame produces sound waves, which propagate outward in the form of spherical waves. When these sound waves reach the position of the mother flame, the peaks and valleys of sound waves will affect the temperature and airflow of the flame, leading to the change of light and shade of the flame.
Interference phenomenon:
When the distance between the sub-flame and the mother flame meets certain conditions, the peaks and valleys of sound waves will overlap with each other, resulting in the alternation of light and dark of the flame and the formation of light and dark stripes. This phenomenon is the interference of sound waves. By observing the change of light and dark stripes, we can understand the characteristics of sound wave such as frequency and wavelength.
Experimental application:
The mother-child flame experiment is an intuitive and vivid method to observe the phenomenon of acoustic interference. Although it has limited use in scientific research, it can help students understand the basic characteristics and interference principle of sound waves. At the same time, this kind of experiment is also used as a demonstration experiment in some physics teaching to help students better understand the wave theory and interference phenomenon.
Henrik Hertz, a researcher of mother-child flame experiment, introduced;
First of all, birth and background:
Henrik Hertz was born in Hamburg on February 22nd, 1857, when Hamburg was part of the free city of Hamburg (now Germany). He was born in a wealthy family, and his family attached great importance to education.
Second, the academic background:
Hertz received a high-quality education in Hamburg and later entered the University of Berlin to study engineering. His academic interest gradually turned to physics, and he conducted in-depth research under the guidance of physicist hermann von helmholtz.
Three. Achievements and impacts:
The electromagnetic wave research of 1 Hz laid the foundation of radio communication and radio technology, and provided important support for the later development of communication technology. His work also had a far-reaching impact on the development of Helmholtz and Maxwell's electromagnetic theory.
2. Henrik Hertz became one of the important pioneers of modern physics with his outstanding contributions in the field of electromagnetic waves and sound waves, and was also honored as the "father of electromagnetic waves". His work laid a solid foundation for the development of electromagnetism and wave theory.