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why electromagnetic wave theory was not able to explain the results of black body radiation and photoelectric effect??? please answer at +1 level.....

why electromagnetic wave theory was not able to explain the results of black body radiation and photoelectric effect???


 


please answer at +1 level.....

Grade:11

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
electromagnetic theory states that the electromagnetic fields resemble a wave in both structure and action. Electromagnetic waves coincide with the measurement of the speed of light, making light an electromagnetic wave itself.
black body radiation-Any object with a temperature above absolute zero emits light at all wavelengths. If the object is perfectly black , then the light that comes from it is called blackbody radiation.The energy of blackbody radiation is not shared evenly by all wavelengths of light.
classical physics could not explain the shape of the blackbody spectrum.The electrons in a hot object can vibrate with a range of frequencies, ranging from very few vibrations per second to a huge number of vibrations per second. In fact, there is no limit to how great the frequency can be. Classical physics said that each frequency of vibration should have the same energy. Since there is no limit to how great the frequency can be, there is no limit to the energy of the vibrating electrons at high frequencies. This means that, according to classical physics, there should be no limit to the energy of the light produced by the electrons vibrating at high frequencies. It is not true Experimentally, the blackbody spectrum always becomes small at the left-hand side
photoelectric effect:-When light shines on the surface of a metallic substance, electrons in the metal absorb the energy of the light and they can escape from the metal's surface. This is called the photoelectric effect, Using the idea that light is a wave with the energy distributed evenly throughout the wave, classical physicists expected that when using very dim light, it would take some time for enough light energy to build up to eject an electron from a metallic surface.But this is wrong.Experiments show that if light of a certain frequency can eject electrons from a metal, it makes no difference how dim the light is. There is never a time delay.

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