Listen to the sound of twinkling star
Instead of a star in the sky, we observed a flight obstacle light.
We can hear the sound of the fluctuating light by High-speed reproduction technique. It sounds like a noise. Is it a 1/f noise?
Bowed string
When playing the violin, frictional vibrations occur between the string and the bow. This is known as the stick–slip phenomenon, which consists of:
Stick stage: the string moves at a constant speed together with the bow.
Slip stage: the string rapidly moves back within a short duration.
Movie shows the string vibrating at 125 Hz, Frame rate: 1,000 fps.
Logistic map and scratching sound
Yasushi Miki, “Using the logistic map to generate scratching sounds,” The Mathematica Journal, vol. 15 (2013)
Can you find the 4-digit number 2020, the year of Tokyo Olympic and Paralympic Games in the 10-thousand-digit number of π?
Where does the 4-digit number 2025, the year of Osaka EXPO appear in the 10-thousand-digit number π?
The number 2025 does not appear in the 10-thousand-digit of π. It appears first at the 33 955th digit！
Click here to get Mathematica CDF file.
Download “RhombusPuzzle3.cdf.” (https://www.mikion.org/s/RhombusPuzzle3.cdf)
