8/18/2019 4th-exam-2016

1/1

SECTION (B) (40 marks)

1 -Defne each o the ollown!s" (1# marks)$ %onochromator& Transmttance an'

sorance$$ %olar asor*t+t,$$ Chrom*hores an' .ochromes$+$ /!ht sorces n s*ectro*hotometr,$

  +$ Intererences n S an' metho's oa+o'ance$

- Bre2, 'escre each o the ollown!s" (1#marks)

  $ tom3aton *rocess n S$ Otlne the

a'+anta!es an' 'sa'+anta!es o rnaceatom3ers$

  $ %oleclar tomc electronc transton  $ 5hoton trans'cers$  +$ Stan'ar' a''ton metho' n traceanal,ss$  +$ /mtatons o Beer6s law$

  7- t #80 nm& whch s the wa+e len!th o ts ma.mm

asor*ton& the com*le. e(SCN)9

& has a molar

asor*t+t, o $4#.107 / cm-1mol-1$Calclate"

  $ The asorance o a $#.10-

 m% solton o thecom*le. n 1-cm cell$  $ The asorance o a solton n whch the

concentraton o the com*le. s twce n a -cm cell$  $ The transmttance o the solton 'escre' n ()$(10 marks)-----------------------------------------------------------------------------------

--------------------Best :shes

5ro$ hme' El:akeel - 5ro$ %a!'a kl