AP EAMCET202316 May 2023Evening ShiftChemistryStructure of AtomActual
The laser in an audio compact disc uses light of wavelength 7.8 10^2 ~nm . What is the frequency of light emitted by laser?
Options
- A1.8 10¹⁴ ~s ⁻¹
- B2.6 10¹⁴ ~s ⁻¹
- C5.4 10¹⁴ ~s ⁻¹
- D3.8 10¹⁴ ~s ⁻¹
Correct answer
D. 3.8 10¹⁴ ~s ⁻¹
Step-by-step solution
=7.8 10^2 ~nm =7.8 10^2 10⁻⁹ ~m aligned & =7.8 10⁻⁷ ~m & v = c = 3 10^8 ~ms ⁻¹ 7.8 10⁻⁷ ~m =3.8 10¹⁴ ~s ⁻¹ aligned