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According to Planck's equation, DeltaE=h...

According to Planck's equation, `DeltaE=hv`. The energy `DeltaE` corresponding to intense yellow line of sodium at 589 mm is

A

2.11 eV

B

43.37 eV

C

47.12 kJ

D

2.11 kcal

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaE=hv=(hC)/lambda=(6.62xx10^(-34)xx3xx10^8)/(589xx10^(-9))`
`=0.0337xx10^(-17) J`
As 1eV=`1.602xx10^(-19) J`
`therefore DeltaE=2.11 eV`
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