Explanation Given data: Minimum photon energy required is 1.7 eV. Formula used: Write the expression for intensity of light. I = E total A t (1) Here, E total is the total energy, A is the area of the pupil, and t is the time. Write the expression for total energy. E total = N E photon (2) Here, N is the number of photon and E photon is the energy of each photon. Write the expression for energy of photon and wavelength. E photon = h c λ (3) Here, h is the plank’s constant with standard value as 6.63 × 10 − 34 J ⋅ s , c is the speed of light with standard value as 3

College Physics: A Strategic Approach (3rd Edition)

3rd Edition

ISBN: 9780321879721

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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