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Electron has the longest de Broglie wavelength because LU Rb a eee ‘, Jt is independen, , Give any two characteristics of photon.( MAR 2014) y of the radiation, , Ss, The photon energy and momentum depend only on frequene, intensity of the radiation., e Photons trayel with speed of light ., e Photons are electrically neutral., e All photon emitted from a source travel with same velocity, e The rest mass of a photon is zero., 5. Write any two SHI cin and Lenard observations on photoelectric effect.(Sep 2016), Lenard observed that when ultraviolet radiations were allowed to fall on emitter plate of, n the circuit. As soon as, , e, anevacuated glass tube enclosing two electrodes, current flows 1, , UV radiation stopped, the current flow was also stopped., e Hallwach and Lenard also observed that UV light of frequ, , value was incident to emitter plate, no electrons were emitte, , ency smaller than a certain, d. This minimum frequency is ¢, , , , threshold frequency