en light of 650nm wavelength fell on copper metallic surface there was no reading on the ammeter. After that when he changed aluminum with copper. Suddenly he started see reading on the ammeter. Explain this phenomena?

en light of 650nm wavelength fell on copper metallic surface there was no reading on the ammeter. After that when he changed aluminum with copper. Suddenly he started see reading on the ammeter. Explain this phenomena?

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Question

When light of 650nm wavelength fell on copper metallic surface there was no reading on the ammeter. After that when he changed aluminum with copper. Suddenly he started see reading on the ammeter. Explain this phenomena?

1. Suppose Richard was working with light matter interaction. He arranged an experimental setup just as the figure below
Light
Detector
Metal surface
Electrons
Ammeter.
Vacuum chamber
Battery
(a)When light of 650nm wavelength fell on copper metallic surface there was no reading on the ammeter. After that when he changed aluminum
with copper. Suddenly he started see reading on the ammeter. Explain this phenomena?
(b) As he increased the reverse voltage by the battery then again current reading became zero. Why did this happen?
(c) If work function of aluminum is 4.4eV. Find what is minimum wavelength of light required to generate photocurrent.
2. Why Compton effects cannot be triggered by visible light ?
3. Prof De Broglie equation. Explain why everything in this universe have wavelength.
4. What is work function? How work function regulates photoelectric effect?

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