NCERT Textual Problems Unit-7-B Q.7.27 Monochromatic radiation of wavelength 640.2nm (1 nm = 10-9 m) from a neon lamp irradiates a photosensitive material made of cesium on tungsten. The stopping voltage is measured to be 0.54 V. The source is…
Electron microscope It is an opto-electronic device having extremely higher resolving power in comparison to that of an optical microscope. De-Broglie hypothesis had been the key factor that led to the development of new branch of optics in Physics called…
NCERT Solutions For Class 12 Physics unit-7 It consists of the NCERT Textual problems related to the unit-7. Q. 7.01 Find the (a) maximum frequency and (b) minimum wavelength of X-rays produced by 30 kV electrons. Answer: Given here, that…
De-broglie hypothesis Similar to the radiations, which behave as a particle and also like a wave, the matter particle in motion behave like a wave in addition to the particle nature. [De-Broglie hypothesis] In 1924, Louis de-Broglie, a French scientist,…
M.C.Qs. wave nature of matter It consists of numerical problems related to dual nature of radiations and matter in the 12th physics unit (7). Problem: 01 1. The momentum of a photon of wavelength 5,000 Ao will be (A) 1.3…
Photoelectric effect-2 This part of Photoelectric effect-2 describes the determination of Plank’s constant and work function of the metals. It also describes the relation between cut off potential, frequency of incident photon and threshold frequency/wavelength, Failure of wave theory of…
Photoelectric effect A metal surface loses negative charge due to the ejection of electrons from its surface when exposed to UV light. It is the phenomenon of emission of the electrons from the metal surfaces when the radiations of suitable…
