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. Which of the following statement (s) is/are correct? (i) E lies in UV region while G lies in visible region (ii) The energies D and F alone are not sufficietn to remove electron from isolated gaseous H=atom. (iii) In the spectrum the increasing order of lamda, for all type of laser is IIlt III lt IV lt I (iv) None of the above statement is correct

A laser (light amplification by stimulated emission of radiation) prov

1.	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. Which of the following statement (s) is/are correct? (i) E lies in UV region while G lies in visible region (ii) The energies D and F alone are not sufficietn to remove electron from isolated gaseous H=atom. (iii) In the spectrum the increasing order of lamda, for all type of laser is IIlt III lt IV lt I (iv) None of the above statement is correct
Answer» Only (iv) (i) and (II) only (i),(ii) and (iii) only (ii) and (iii) only Solution :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