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A laser (light amplification by stimulat...

A laser (light amplification by stimulated emission of radiation) provides a coherent (in phase )nearly monochromatic source of high intensityi light. Lasers are used in eye surger, CD/DVD players basic research etc. some miodern eye lasers can be tuned to emit a desired wavelength. The following table shows the `lamda(nm),v(s^(-1))` and E(J) but some of the data is missing.

The value of A and H will be ............ and .................. respectively.

A

Only (iv)

B

(i) and (ii) only

C

(i),(ii) and (iii) only

D

(ii) and (iii) only

Text Solution

Verified by Experts

The correct Answer is:
B
The value of `E=1401Å`, which lies in UV region
The value of (D) is 2.55 eV which is less than 13.6 eV required to remove a permanently from H-atom (F) is 8.86eV which is also not sufficient
`lamda_(1)=6329Å`
`lamda_(ii)=4879Å`
`lamda_(iii)=1401Å` Hence IV`gt` I `gt` II` gt` III
`lamda_(iv)=6630Å`
Hence only (i) and (ii) are correct. So, correct option is B
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