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13 November, 01:44

A ray of violet light has a wavelength of about 4.2*10-7 m. will exposure to violet light cause electrons to be emitted from cesium?

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  1. 13 November, 01:58
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    The wavelength of violet light is given as 4.2x10^-7 m and the speed of light is 3x10^8 m/sec

    The equation relating between the frequency and the wavelength is as follows:

    speed of light = wavelength x frequency

    Substitute with the givens in the above equation to get the frequency of violet light as follows:

    frequency = (3 x 10^8) / (4.2 x 10^-7) = 7.14285 x 10^14 Hz

    The threshold frequency of cesium is 9.39x10^14 Hz.

    Since the frequency of violet light is less than the threshold frequency of cesium, therefore, the exposure to violet light won't cause electrons to be emitted from cesium.
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