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    The answer is b but I have no idea why, can someone please explain.

    https://imgur.com/a/VOsLI
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    isn't the photon energy formula

    E = hf = hc/λ

    in the data and formula book?

    you can do a quick elimination of some answers if you can remember that high frequency (short wavelength) photons carry more energy than low frequency (long wavelength) photons

    A) hc/f would require energy to be lower for high frequency photons
    D) hλ/c would require energy to be lower for short wavelength (high frequency) photons
 
 
 
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