Brilliant Thought-Provoking Satirical Illustrations by Pawel Kuczynski
By Mark Bagley & Randy Emberlin
I. Want. Them. AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAALLLLLLLLLLLLLLL.
(Done by lumpyhippo on DeviantArt)
How drums produce different frequencies:
Just like a flute, for example, drums have harmonic frequencies, i.e. a frequency in which the sound is ‘stable’ and consistent. and just like a flute, there are multiple harmonics, the first being one in which the entire membrane moves as one, up and down, which is shown in the first gif.
The next harmonic causes the membrane to split into two sides, one going up and one going down, which occurs at a frequency 1.59 times larger than the first harmonic frequency. the first frequency depends on other things such as size and material, but from then on all frequencies are specific multiples of the first.
The second gif shows, i believe, the 9th harmonic, and the third gif shows the 8th.
10 Stunning Crater Lakes Around the World
Crater lakes appear when a caldera, a cauldron-like crater formed by the collapse of land following a volcanic eruption, becomes filled with water. Featured above are some of the most stunning, naturally formed crater lakes around the world.
- Crater Lake (Okama), Mount Zao, Honshu, Japan
- Kelimutu Crater Lake, Flores Island, Indonesia
- Crater Lake, Mount Ruapehu, New Zealand
- Crater Lake, Mount Pinabuto, Luzon, Philippines
- Quilotoa Crater Lake, Ecuador
- Vulcan Point within Crater Lake, Taal Volcano, Luzon, Philippines
- Viti Geothermal Crater Lake, Askja, Iceland
- Crater Lakes in the Albertine Rift, Africa
- Kerid Crater Lake, Iceland
- Crater Lake, Mount Mazama, Oregon, USA