Light of frequency 9.6 × 1014 Hz is incident on a metal surface. The stopping potential for this metal at this frequency is 2.2 V. What is the cutoff frequency of this metal? 1. 5.1 × 1014 Hz 7.8 × 1014 Hz 8.5 × 1014 Hz 4.3 × 1014 Hz 9.6 × 1014 Hz
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