A ripple crosses a pond, a guitar string sings, and an organ pipe fills a hall. They are all waves. In this course we learn what a wave is and how fast it travels. We see what happens when two waves meet: interference and beats. Then we look at standing waves, the secret behind every string and every pipe, and at the resonance tube experiment. Python helps us draw the waves and check our numbers. For Class 11.
3 lessons, about 1 h 30 min5 simulations8 problems6 practice questionsPython in every lesson
We describe a wave with its wavelength, frequency and speed. When two waves meet, their displacements add.
A wave and its reflection make a standing wave. A string or a pipe can only vibrate at special frequencies, the harmonics.
When a source of sound and a listener move towards each other, the listener hears a higher pitch; when they move apart, a lower one. A moving source crowds its waves together in front and spreads them out behind; a moving listener meets the crests more or less often. The pitch heard is , with the signs for motion towards each other.
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