A quantum of light having energy E has wavelength equal to 7200 Å. The frequency of light which corresponds to energy equal to 3E, is:
- A1.25 × 10¹⁴ s⁻¹
- B1.25 × 10¹⁵ s⁻¹
- C1.25 × 10¹³ s⁻¹
- D1.25 × 10¹⁶ s⁻¹
✓ Correct answer: B
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