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301. X-raysarediffractedbyacrystalbutnotbyadiffractiongratingbecause_____________?

A.Theionsinacrystalarewellarranged
B.ThelinesinadiffractiongratingcannotreflectX-rays.
C.ThepenetrationpowerofX-raysishighinadiffractiongrating
D.ThewavelengthsofX-raysareofthesameorderofmagnitudeastheseparationbetweenatomsinacrystal

302. UVradiationcanbeproducedby______________?

A.Heatingthefilament
B.Electronexcitationinthegas
C.Ionizationofatoms
D.Alltheabove

303. Wave-likecharacteristicofelectronisdemonstratedby______________?

A.Linespectrumofatoms
B.Productionofx-rays.
C.Diffractionbycrystallinesolids
D.Photoelectriceffect

304. Electroncannotexistinthenucleusitisconfirmedbyobservingthat______________?

A.Itdoesemitradiation
B.Itssizeascomparetoprotonandneutronisverysmall
C.Noantiparticleofelectronispresent
D.Thevelocityofelectronmustbeveryhighaccordingtouncertaintyprinciple

305. Innormalstateofenergytheincidenthighenergyphotonswillbe______________?

A.Stimulated
B.Absorbed
C.CauseX-rayemission
D.Causelaserproduction

306. Inlaserproductionthestateinwhichmoreatomsareintheupperstatethanintheloweroneiscalled_____________?

A.Metalstablestate
B.Normalstate
C.Invertedpopulation
D.Alltheabove

307. Themetastablestateforanatominlaserlightis_____________?

A.1-4sec
B.1-5sec
C.1-3sec
D.1-8sec

308. InHe-Nelaserthelasingactionisproducedby_______________?

A.Neonly
B.He-Neboth
C.ElectronsofHe
D.ElectronsNe

309. Reflectingmirrorsinlaserisusedto______________?

A.Furtherstimulation
B.Lasingmore
C.Forproducingmoreenergeticlasers
D.All

310. Thevelocityoflaserlightis___________________?

A.Lessthanordinarylight
B.Morethanordinarylight
C.Equaltoordinarylight
D.Differentfordifferentcoloursorfrequency