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Marjan Kelemen

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last 3 solved tasks
Find the country and its capital city, using the move of a chess knight. First letter is S. Length of words in solution: 5,8.
Find the country and its capital city, using the move of a chess knight. First letter is C. Length of words in solution: 5,7.
Find the country and its capital city, using the move of a chess knight. First letter is V. Length of words in solution: 7,4,7,4.

Clinton Joseph Davisson

Born 22 Oct 1881; died 1 Feb 1958 at age 76. American physicist who shared the Nobel Prize for Physics in 1937 (with Englishman George P. Thomson) for discovering that electrons can be diffracted like light waves, thus verifying the thesis of Louis de Broglie that electrons behave both as waves and as particles. Davisson studied the effect of electron bombardment on surfaces, and observed (1925) the angle of reflection could depend on crystal orientation. Following Louis de Broglie's theory of the wave nature of particles, he realized that his results could be due to diffraction of electrons by the pattern of atoms on the crystal surface. Davisson worked with Lester Germer in an experiment in which electrons bouncing off a nickel surface produced wave patterns similar to those formed by light reflected from a diffraction grating, and supporting de Broglie's electron wavelength = (h/p). This discovery has been applied to the study of nuclear, atomic, and molecular structure. Davisson helped develop the electron microscope which uses the wave nature of electrons to view details smaller than the wavelength of visible light.

The Monastery on a Cliff

There is a story about a monastery perched high on a cliff several hundred feet in the air. The only way to reach the monastery was to be suspended in a basket which was pulled to the top by several monks who pulled and tugged with all their strength. Obviously the ride up the steep cliff in that basket was terrifying. One tourist got exceedingly nervous about half-way up as he noticed that the rope by which he was suspended was old and frayed. With trembling voice, he asked the monk who was riding with him in the basket how often they changed the rope.
The monk thought for a moment and answered brusquely, "Whenever it breaks."
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