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In this topic you will learn about motion of mechanical waves caused by the longitudinal and transverse motion. You will know how the sound waves are created. Relationship between wavelength, frequency and wave numbers. You will also understand the standing waves in musical instruments and Doppler&#39;s effect for measuring speed of moving sound sources and Mach number to cross the sound barrier.

NISH 2021

Mechanical Wave Motion Segment 6: The Doppler Effect

## Dr. Nishikant (Nish) Sonwalkar: Academician, Scientist, Musician

![](https://assets.underline.io/uploads/markdown_image/1/image/0f9b63a0b3deba4a355d98e2c87af68a.png)

Dr. Sonwalkar is regarded as a leading expert in the application of computers in education. He has extensive research and development experience in hypermedia authoring, mobile learning, adaptive learning, and brain-based synaptic learning, advanced scientific visualization, database management systems, and computer simulation.

After receiving doctoral degree from MIT in the area of Molecular Dynamics of Nano-interfaces, he joined MIT as faculty in Mechanical Engineering, but his passion for technology enabled education led him become the founding director of Hypermedia Teaching Facility (Hypermedia Lab) at MIT and later he was appointed as the Principal Educational Architect of MIT.

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In this topic you will learn about motion of mechanical waves caused by the longitudinal and transverse motion. You will know how the sound waves are created. Relationship between wavelength, frequency and wave numbers. You will also understand the standing waves in musical instruments and Doppler's effect for measuring speed of moving sound sources and Mach number to cross the sound barrier.

lecture

In this segment you will learn about the reflection, refraction, and lenses.

Physical Optics Segment 1: Reflection of Light

Physical Optics Segment 2: Refraction of light

Physical Optics Segment 3: Total Internal Reflection

Physical Optics Segment 4: Images Made by Concave Mirrors

Physical Optics Segment 5: Images Made by Lenses

Physical Optics Segment 6: Optical Instruments

In this segment, we will learn about the electromagnetic spectrum. We will discuss electromagnetic waves, the wave equations, wavelength, frequency, and polarization.

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Mechanical Wave Motion Segment 6: The Doppler Effect

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Physical Optics Segment 1: Reflection of Light

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