22. Which of the following lists ofnuclear fusion processes runs in theorder of increasing energyrequirement?(I) Be-Be (II) He-He (III) H-H (IV) C-C (a)(I), (II), (III), (IV)(b)(IV), (III), (II), (I)(c)(III), (II), (I), (IV)(d)(IV), (I), (II), (III)Answer ________
23. Tritium, 3H, is used in glowing“EXIT” signs that do not requireelectricity. If the half-life of tritiumis 12.26 y, what percentage of theoriginal quantity of the isotoperemains after 18.5 y?(e)0.632 %(f)63.2 %(g)35.1 %(h)1.51 %Answer _________ 24. The line spectra of Ca and Ca+are Answer _________ 25. The work function of sodium isΦ=2.9 x 10-19J. What is themaximum wavelength of photonthat can cause ejection ofphotoelectrons from a sodiumsurface? Answer _________The next two questions are basedon the following diagram showingthe energy levels of the H atom. 26. Which transition corresponds toa line in the Balmer series? Answer _________ 27. Which transition corresponds toa photon having the longestwavelength? (a)a(b)b(c)c(d)dAnswer __________Energyn=1n=2n=3n=4n=5a b d c
28. Which of the following has thelongest De Broglie wavelength? Answer _________ 29. The Rydberg equation can bemodified to work for any ion,provided it has only one electron.The modified equation isΔE = R Z2(1/n12– 1/n22)where R is the Rydberg constant inappropriate units, and Z is thecharge of the nucleus. Which of thefollowing transitions will have theshortest wavelength emission line? Answer _________
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