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OJ-Hick

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1) Explain the problem and state how the measurement can be made more accurate when measuring the fringe width in Young's Double Slit experiment (laser/monochromatic light source)

2) Explain how the following formula follows from the definition of intensity:

I= P/(4 x pi x r2)

3) Photoelectical Emission:

(i)When p.d is set to zero the microammeter indicates a small current. Why?

(ii) The cathode is made from sodium - work function 3.7 x 10^-19 J. Show the stopping potential for radiation of frequency 7.5 x 10^14 Hz is approx 0.8V

(iii) Sketch a graph to show how current changes as the reverse potential difference V is increased from 0 to 1.0 V

THANKS GUYS HOPE YOU CAN HELP