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221.Ifaphotonisreflectedfromthemirrorthenthechangeinmomentumofeachphotonis_______________?

A.Zero
B.Double
C.Half
D.1

222. Ifnnumberofthephotonisstrikingonametalsurfacethentotalmomentumexertedis_______________?

A.p
B.n
C.
D.None

223. Aphotonofwavelength9nmbehaveslikeaparticleofmass______________?

A.5.53×1-36kg
B.kg.
C.2.46×1-36kg
D.1.84×1-44kg

224. Thevelocityofaparticleofmassmofde-Brogliewavelengthλis______________?

A.v=3××16ms-1
B.v=2××1ms-1
C.v=2××6ms-1
D.v=2××16ms-1

225. InDavisson-Germerexperimentthediffractedprotonfromcrystalshows______________?

A.Particleproperty
B.Waveproperty
C.Lightproperty
D.Quantumproperty

226. Ifadiffractiongratingisplacedinthepathofalightbeamitreveals______________?

A.Waveproperty
B.Particleproperty
C.Energyparticle
D.Electromagneticwaveproperty

227. Inanelectronmicroscope,weuseenergeticparticlesbecauseof______________?

A.Penetratingpowerishigh
B.Kineticenergyislarge
C.Wavelengthisveryshort
D.Alltheabovereasons

228. Intheelectronmicroscope,electric&magneticfieldsareusedas_______________?

A.Electromagneticgun
B.Sourceofelectromagneticwaves
C.Deflectingchargedparticle
D.Convergingsourceofelectrons

229. Athree-dimensionalimageisobtainedby________________?

A.Electronmicroscope
B.Scanningelectronmicroscope
C.Magneticimaging
D.Noneoftheabove

230. Theuncertaintyinmomentum&positionisduetoits_____________?

A.Propertyofmatterandradiation
B.Two-dimensionalmotion
C.Emissionofthecertainwavelength
D.Veryhighvelocity