When light of frequency \( 2.2 \times 10^{15} \mathrm{~Hz} \) is in...

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When light of frequency \( 2.2 \times 10^{15} \mathrm{~Hz} \) is incident on a metal surface, the emitted photoelectrons are stopped by a negative anode potential of \( 6 \cdot 6 \mathrm{~V} \). When the experiment is repeated with light of frequency \( 4.6 \times 10^{15} \mathrm{~Hz} \), the stopping potential is found to be \( 16.5 \) V. Determine the Planck's constant.
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