【英语翻译28Parallelwavefrontsincidentonanopeninginabarrierarediffracted.Forwhichcombinationofwavelengthandsizeofopeningwilldiffractioneffectsbegreatest?(1)shortwavelengthandnarrowopening(2)shortwavelengthandwideopen】

　　英语翻译

　　28Parallelwavefrontsincidentonanopeningina

　　barrierarediffracted.Forwhichcombinationof

　　wavelengthandsizeofopeningwilldiffraction

　　effectsbegreatest?

　　(1)shortwavelengthandnarrowopening

　　(2)shortwavelengthandwideopening

　　(3)longwavelengthandnarrowopening

　　(4)longwavelengthandwideopening

　　32Aphotonoflighttravelingthroughspacewitha

　　wavelengthof6.0×10–7meterhasanenergyof

　　(1)4.0×10–40J(3)5.4×1010J

　　(2)3.3×10–19J(4)5.0×1014J

　　34Thechargeofanantistrangequarkis

　　approximately

　　(1)+5.33×10–20C(3)+5.33×1020C

　　(2)–5.33×10–20C(4)–5.33×1020C

　　35Whatfundamentalforceholdsquarkstogether

　　toformparticlessuchasprotonsandneutrons?

　　(1)electromagneticforce

　　(2)gravitationalforce

　　(3)strongforce

　　(4)weakforce

　　39Whatisthemagnitudeoftheforceneededtokeepa60.-newtonrubberblockmovingacrosslevel,dry

　　asphaltinastraightlineataconstantspeedof2.0meterspersecond?

　　(1)40.N(3)60.N

　　(2)51N(4)120N

　　50Whatisthewavelengthofalightraywithfrequency5.09×1014hertzasittravelsthroughLucite?

　　(1)3.93×10–7m(3)3.39×1014m

　　(2)5.89×10–7m(4)7.64×1014m

　　51Whatisthetotalnumberofquarksinaheliumnucleusconsistingof2protonsand2neutrons?

　　(1)16(3)8

　　(2)12(4)4

　　6.0m

　　0.20m

　　–0.20m