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    • Thread Starter

    any help with these 2 questions would be awesome as im completely stuck :confused:

    1. When radiation of wavelength l is incident on a metallic surface, the stopping potential is 4.8 volts.
    If the same surface is illuminated with radiation of double the wavelength, then the stopping
    potential becomes 1.6 volts. What is the threshold wavelength for the surface?

    2. The transmission probability (PT) describes the likelihood of an incident particle, of given
    energy, passing through a rectangular barrier of width L. For a particular system, PT = 1x103.
    What will be the value of PT when we double the width of the barrier?
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Updated: March 17, 2011

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