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Complete Test Bank Essentials of Radiographic Physics and Imaging 3rd Edition Johnston Questions & Answers with rationales (Chapter 1-17)a$14.39
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1. Thesiearliestsiatomicsitheorysiissigenerallysiassociatedsiwith
a. Bohr
b. Leucippus
c. Democritus
d. Dalton
ANS:s i s i B
Althoughsihissitheorysiwassisomewhatsivague,siLeucippussiissimostsioftensithesiearliestsipersonsiasso
ciatedsiwithsiatomicsitheory.
2. ThesiwordsiatomsiissiderivedsifromsithesiGreeksiwordsiatomos,simeaning
a. nuclear
b. small
c. indivisible
d. invisible
ANS:s i s i C
ThesiGreeksiwordsiatomossimeanssi―indivisible.‖
3. Insithesiearlysi1800ssiEnglishsichemistsiJohnsiDaltonsitheorizedsithat
a. elementssiformsicompounds
b. atomssiaresiuniquesitosieachsielementsiinsisizesiandsimass
c. asichemicalsireactionsiresultssifromsiatomssibeingsirearranged
d. allsiofsithese
ANS:s i s i D
Assiasiresultsiofsihissiexperiments,siJohnsiDaltonsitheorizedsithatsielementssiformsicompounds,siatom
ssiaresiuniquesitosieachsielementsiinsisizesiandsimass,siandsithatsiasichemicalsireactionsiresultssifromsiato
mssibeingsirearranged.
4. Discoverysiofsithesielectronsiissiattributedsito
a. Dalton
b. Bohr
c. Thomson
d. Rutherford
ANS:s i s i C
JosephsiJohnsi―J.J.‖siThomsonsideterminedsithatsithesielectronsiwassiasinegativelysichargedsipartsiofsit
hesiatom.
5. Thesi―plumsipuddingsimodel‖siissiassociatedsiwith
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
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si si si si si si si si si si
ging 3rd Edition Johnston
si si si
ANS:s i s i D
Basedsionsithesiphysicalsiarrangementsiofsiraisinssiinsiasiplumsipudding,siThomsonsidescribedsithesiat
omsiandsisurroundingsinegativelysichargedsiparticlessi(electrons).
6. Thesiearliestsiatomicsitheorysibasedsionsiansiarrangementsisimilarsitosithesisolarsisystemsiissiattribute
dsito
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS:s i s i B
Rutherfordsidevelopedsithesitheorysithatsithesiatomsiconsistedsiofsiasiverysidensesinucleussiwithsismallsielectr
onssirotatingsiaround,sisimilarsitosithesisunsiandsiplanets.
7. Thesimostsicommonlysiknownsimodernsiatomicsitheorysiwassidevelopedsiby
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS:s i s i A
NielssiBohrsirefinedsiRutherford’ssiatomicsitheory,sibasedsionsithesisolarsisystem,siintosithesimostsico
mmonlysiknownsiatomicsitheorysitoday.
8. Thesithreesifundamentalsiparticlessiofsithesiatomsiaresithe
a. element,sinucleus,siandsielectron
b. electron,sinucleus,siandsiproton
c. neutron,sielectron,siandsiproton
d. nucleus,siproton,siandsineutron
ANS:s i s i C
Thesithreesifundamentalsicomponentssiofsithesiatomsiaresithesiproton,sielectron,siandsineutron.
9. Thesiatomicsinucleussicontains
a. protonssiandsineutrons
b. protonssiandsielectrons
c. electronssiandsineutrons
d. allsiofsithese
ANS:s i s i A
Thesiatomicsinucleussicontainssivaryingsiamountssiofsiprotonssiandsineutrons,sidependingsionsithesiel
ement.
10. Thesicomponentsiofsithesinucleussithatsihassiasipositivesichargesiandsimasssiissithe
a. electron
b. neutron
c. proton
d. nonesiofsitheses
i ANS:s i C
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si si si si si si si si si si
11. Thesicomponentsiofsithesinucleussithatsihassimasssibutsinosielectricalsichargesiissithe
a. electron
b. neutron
c. proton
d. nonesiofsithese
ANS:s i s i B
Thesineutronsiissifoundsiinsithesinucleus;siitsiissiverysisimilarsitosithesiprotonsibutsihassinosielectricalsicha
rgesi(neutral).
12. Thesifundamentalsicomponentsiofsithesiatomsithatsihassithesismallestsimasssiissithe
a. electron
b. neutron
c. proton
d. nonesiofsithese
ANS:s i s i A
Thesielectronsihassisignificantlysilesssimasssithansithesineutronsiorsiproton.
13. Thesimasssiofsiansiatomsiissiprimarilysiduesitosithesimasssiofsithe
a. neutrons
b. nucleus
c. electrons
d. protons
ANS:s i s i B
Thesinucleus,siconsistingsiofsibothsiprotonssiandsineutrons,siaccountssiforsithesimajoritysiofsithesimass
siofsiansiatom.
14. Ifsiansiatomsihassimoresiprotonssithansielectrons,siitsiwill
a. havesiasinegativesicharge
b. havesiasipositivesicharge
c. besielectricallysineutral
d. havesineithersiasipositivesinorsinegativesicharge
ANS:s i s i B
Ansiatomsiwithsimoresiprotonssithansielectronssiwillsihavesiasipositivesicharge.
15. Ifsiansiatomsihassimoresielectronssithansiprotons,siitsiwill
a. havesiasinegativesicharge
b. havesiasipositivesicharge
c. besielectricallysineutral
d. havesineithersiasipositivesinorsinegativesicharge
ANS:s i s i A
Ansiatomsiwithsimoresielectronssithansiprotonssiwillsihavesiasinegativesicharge.
16. Ifsiansiatomsihassithesisamesinumbersiofsielectronssiandsiprotonssiitsiwill
a. havesiasinegativesicharge
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