Decibels
Über den Vortrag
Der Vortrag „Decibels“ von Jared Rovny, PhD ist Bestandteil des Kurses „Semester I (Ethiopia National Curriculum / Year I)“.
Quiz zum Vortrag
What is the dimension of sound intensity?
- Power per area
- Energy per area
- Force per area
- Energy per volume
- Power per volume
How many decibels is a sound heard with 100I₀ of intensity?
- 20 dB
- 2 dB
- 100 dB
- 10 dB
- 1 dB
Why do we use the decibel scale to classify the intensity of sounds which a human can hear?
- The decibel scale is more compatible with our perception of the difference in the loudness of different sounds that we hear as compared to the intensity scale.
- Its just a more convenient way of representing intensity.
- It is easier to work with logarithms in physical calculation related to sound.
- There is not much difference between them and both can be used to classify the loudness of a sound.
- Because our ears perceive the frequency of a sound wave logarithmically.
What happens to the energy of a sound as it spreads out in a medium?
- The energy spreads out over larger spheres centered at the source, hence there is a reduction in the intensity of the sound. The sound energy is eventually lost to the medium in the form of friction and heat.
- The energy spreads out over larger spheres which results in the reduction in the intensity of the sound only.
- The energy of the sound is conserved only the intensity drops at larger distances from the source.
- As the sound intensity dies out over larger distances from the source it gets transferred to chemical potential energy of the molecules in the medium.
- Similar to how energy is transferred from potential to kinetic energy in an oscillating spring, the energy of a sound wave is also transferred between the kinetic and potential energy of the molecules in the medium.
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Dozent des Vortrages Decibels
Jared Rovny, PhD
Dr. Jared Rovny has been a Lecturer at Yale University in Connecticut, USA since 2013.
He obtained his PhD in Physics from Yale University in 2019. He was awarded the D. Allan Bromley Graduate Fellowship in Physics in 2019 and the Princeton Quantum Institute Postdoctoral Fellow in 2020.
Currently, he works with Yale's Center for Teaching and Learning at Yale University.
Due to his achievements, he earned the Yale College Prize Teaching Fellowship for his work in PHYS 171 (University Physics for the Life Sciences).
Within Lecturio, Dr. Rovny teaches courses on Physics.
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Very clear explanations. Thank you guys for your educational efforts. You make studying enjoyable.
