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- Lenard conducted studies that explored the size and shape distributions of raindrops. To do this, he constructed a wind tunnel in which water droplets of different sizes cold be held stationary for a short period of time. This helped him recognize that large raindrops are not tear-drop shaped, but are shaped more like a burger bun.
www.physicsbook.gatech.edu › Philipp_Lenard
Jan 14, 2010 · Lenard's trigger hypothesis to explain the photoelectric effect (C1). Lenard made the important experimental determination that in photoelectric phenomena the velocity of the ejected electrons is independent of the intensity of light.
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Philipp Lenard discovered in 1902 that the maximum velocity with which electrons leave a metal plate after it is illuminated with ultra. violet light is independent of the intensity of the light. He concluded that "in the process of emission the light plays only the role of trigger.
During the years 1886–1902, Wilhelm Hallwachs and Philipp Lenard investigated the phenomenon of photoelectric emission in detail. Lenard observed that a current flows through an evacuated glass tube enclosing two electrodes when ultraviolet radiation falls on one of them.
Philipp Lenard – 1902 . Philipp Lenard was a student of Heinrich Hertz. Lenard began studying cathode rays in 1888 and in the process replicated some of Thomson’s experimental work. By 1902, Lenard had done various experiments manipulating different light frequencies and intensities, and measuring the stopping potentials of the rays produced.
In 1902, Philipp von Lenard made observations on the change in electron energy with the change in light frequency. In Lenard’s experiment, he measured potential electron energy and found that the maximum electron kinetic energy is proportional to the frequency of light.
In 1902, Hertz's student, Philipp Lenard, studied how the energy of the emitted photoelectrons varied with the intensity of the light. He used a carbon arc light and could increase the intensity a thousand-fold.
Lenard was an experimentalist of genius, but more doubtful as a theorist. Some of his discoveries were great ones and others were very important, but he claimed for them more than their true value.
