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Q.

The ionisation potential of H-atom is 13.6 V. When it is excited from ground state by monochromatic radiations of 970.6 A0, the number of emission lines will be (according to Bohr's theory)

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a

10

b

8

c

6

d

4

answer is C.

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Detailed Solution

1λ=R1n12−1n22⇒1970.6×10−10=1.097×107112−1n22⇒n2=4∴Number of emission lines N=nn−12=4×32=6

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The ionisation potential of H-atom is 13.6 V. When it is excited from ground state by monochromatic radiations of 970.6 A0, the number of emission lines will be (according to Bohr's theory)