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Compare maximum kinetic energies K1 and K2 when one wavelength is a multiple of the other

The same question, asked 3 times: 11 May 2024 S1, 11 Apr 2026 S2*, 18 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    11 May 2024 S1

    5
    The maximum kinetic energies of photoelectrons emitted are K1K_1 and K2K_2 when lights of wavelengths λ1\lambda_1 and λ2\lambda_2 are incident on a metallic surface. If λ1=3λ2\lambda_1 = 3\lambda_2 then

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  2. Question 2

    11 Apr 2026 S2

    144
    Photoelectrons are emitted from two similar metal plates when wavelengths λ1\lambda_1 and λ2\lambda_2 are incident on them (λ1=1.5λ2)(\lambda_1 = 1.5\lambda_2). If maximum kinetic energy of emitted photoelectrons is E1E_1 and E2E_2 respectively then

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  3. Question 3

    18 Apr 2026 S2

    144
    The maximum kinetic energies of photoelectrons emitted are K1K_1 and K2K_2 when light of wavelength λ1\lambda_1 and λ2\lambda_2 respectively are incident on a metallic surface. If λ1=3λ2\lambda_1 = 3\lambda_2 then

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