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Light of frequency 8.4x10¹⁴ Hz is incident on a metal surface. The stopping potential for this metal at this frequency is 2.8 V. What is the cutoff frequency of this metal? O 3.2 × 10¹⁴ Hz O 1.6 × 10¹⁴ Hz O 8.4 × 10¹⁴ Hz O 7.3 × 10¹⁴ Hz O 4.5 × 10¹⁴ Hz
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