Class Test 1 ( ) Subject Code :Applied Physics (17202/17207/17210) Total Marks :25. Model Answer. 3. Photon travels with the speed of light

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1 Class Test (0-) Sujet Code :Applied Physis (70/707/70) Total Marks :5 Sem. :Seond Model Answer Q Attempt any FOUR of the following 8 a State the properties of photon Ans:.Photon is eletrially neutral. Photon is magnetially neutral. Photon travels with the speed of light.photon possess zero rest mass. State the properties of X rays Ans:. X-ray is eletromagneti wave with very short wavelength. X-ray travels with speed of light.penetrating power of X ray is very high.ionisation power of X ray is very low Draw the neat diagram of photo eletri ell d Define Threshold Frequeny-The minimum frequeny of radiation at whih photoeletri urrent just starts Work funtion- It is defined as the energy required to detah the eletron from metal atom e. An eletron emits photon with frequeny x0 8 Hz.alulate the energy of eletron.(given h=6.6 x 0 - js)

2 Ans: Given ʋ = x0 8 Hz h =6.6 x 0 - js E =? Formula : E = h ʋ Calulation: E =6.6 x 0 - x x0 8 E = 6.8 x 0-6 J f Statethe priniple of LDR and draw its Symol Ans: Priniple- As intensity of light inreases eletrial resistivity dereases. Symol Q. a State the appliation of X rays Ans-.it is used to detet one frature.it is used to destroy ody tumours. it is used to detet raks in the metals. it is used to ure skin diseases 5. it is used to study omplex moleules like ruer,gluose, frutose et 6. it is used to raks in the wall 7. it is used to distinguish etween real and dupliate diamond Derive Einstein photo eletri equation. Ans: onsider UV light inident on metal plate.the photons from light ollide with the surfae atoms. During this ollision surfae atom asor the energy of photon and use it in two ways;-.energy required to detah the eletron from metal atom. kineti energy of ejetion

3 Thus, h ʋ = energy required to detah the eletron + kineti energy h ʋ = W 0 + K.E.max () where, W 0 = photoeletri work funtion we have, W 0 = h ʋ o put this in equation () h ʋ = h ʋ o + K.E.max h ʋ - h ʋ o = K.E.max h( ʋ - ʋ o ) = K.E.max this is the Einsteins photoeletri equation. Where, ʋ o=threshold frequeny Find minimum wavelength of X-rays produed y an x-ray tue operated at 80kV. (Given: h =6.6 x 0 - js, C= x 0 8 m/s, e=.6 x 0-9 C) Ans :Given: h =6.6 x 0 - js C= x 0 8 m/s e=.6 x 0-9 C V= 80kV= 80 x 0 V Λ min =? Formula: Λ min = hc/ev =6.6 x 0 - x x 0 8 /(.6 x 0-9 x80 x 0 ) = 0.55A.U. Q d e State the harateristis of photo eletri effet. Ans: ) It is instatenous proess. ) As intensity of light inreases, photo eletriurrent inreases. ) As frequeny of light inreases, veloity of photo eletron inreases. ) Photoeletri urrent is oserved only when frequeny of inident light is greater than threshold frequeny. 5) This proess is independent on temperature. State planks hypothesis. Ans: aording to lassial theory of radiation,light emits or asors in ontinuous manner. But in 905, Max plank introdue a new theory that, light is not ontinuous in nature ut it ontains quanta s of partile known as photon.

4 Photon travels with the speed of light and possess energy. E = h ʋ Where, h=planks onstant Q. a.state the appliation of photoeletri ell Ans :.it is used in Buglar Alarm.It is used in fire alarm.it is used in lux meter to measure the intensity of light.it is used in automati opening and losing the doors 5. It is used to ontrol traffi signals 6.It is used to ontrol street lighting system. 7.It is used in smoke detetor Explain prodution of X-Rays y using Coolidge tue Experiment. Ans Constrution.It onsist of hard glass tue in whih athode and anode are fixed.athode is in filament form whih is overed y metal ylinder ss. The metal ylinder is kept at higher negative potential than filament.target is Cu rod at the end of whih piee of Tungsten is fixed,target should satisfy following ondition a) it should have high Melting point

5 ) it should have high thermal ondutivity ) it should have high atomi weight.cooling system is used to ool the target 5. Target is set at an angle of 5 with inident eam. Working: When the athode is heated y eletri urrent it produed eletron due to thermioni emissions. The eam of eletron is then foused on the anode (target). The eletrons from athode are aelerated y applying of high voltage etween athode & anode using step up transformer. When these fast moving eletrons are suddenly stopped y tungsten anode, they lose their kineti energy and x rays are produed from the target. Some amount of Kineti energy is onverted to large amount of heat. By ontrolling the filament urrent, the thermioni emission of eletron hene intensity of X- rays an e ontrolled. Find maximum kineti energy of photoeletron ejeted from surfae of metal having frequeny.6 x0 5 Hz.(given ʋ o=. x0 5 Hz) Given; ʋ =.6 x0 5 Hz ʋ o=. x0 5 Hz K.E.max=? Formula; h( ʋ - ʋ o ) = K.E.max Calulation; K.E.max =6.6 x 0 - (.6 x x0 5 ) K.E.max = 0.9 x 0-9 J 5

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