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Can someone please explain why increasing the frequency of the incident light (assuming it is above the threshold frequency) does not increase the photocurrent?

An astronaut set out in a spaceship from Earth orbit to travel to a distant star in our galaxy. The spaceship travelled at a speed of 0.8 c. When the spaceship reached the star the on-board clock showed the astronaut that the journey took 10 years. An identical clock remained on Earth. What...