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A photoelectric experiment was conducted where two different metals were exposed to electromagnetic radiation of different frequencies. For each metal, the measured stopping voltage (Vs) was plotted as a function of the frequency. The resultant plots are 1. the same straight line for both cases. 2. straight lines with the same slope but with different x and y intercepts 3. straight lines with different slopes but with the same y-intercept 4. straight lines with different slopes passing through the origin.

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