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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 21
Total: 67
The mass of an electron is 9.1 × 10–31 kg. If its K.E. is 3.0 × 10–25 J, calculate its wavelength.
Solution:  
K.E. =
1
2
mv2 , v = (
2×3×10−25
3.1×10−31
)
1
2
 = 812 ms−1
Now, λ =
h
mv
 =
6.626×10−34
9.1×10−31×812
 = 8.967 × 10–7 m = 8967 Å
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