Chemistry, asked by muyeensha9341, 1 month ago

uv light of wavelength 800 A and 700A were allowed to fall pn hydrogen atom in their ground state is found to liberate electron with kinetic energy 1.8 ev and 4 ev respectively calculate value of plank constant. ​

Answers

Answered by ayanhjsr
0

λ

hc

=KE+WorkFunction

λ  

1

 

hc

=KE  

1

+WorkFunction→1

λ  

2

 

hc

=KE  

2

+WorkFunction→2

hc[  

λ  

2

 

1

−  

λ  

1

 

1

]=KE  

2

−KE  

1

 

hc[  

700

1

−  

800

1

]=4−1.8

5600

hc

=2.2

⇒hc=2.2×1.6×10  

−19

×5600×10  

−10

Jm

⇒h=  

3×10  

8

ms  

−1

 

2.2×1.6×10  

−19

×5600×10  

−10

Jm

 

⇒h=6.57×10  

−34

Js

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