A sensor is placed at a slit in a single-slit experiment. The sensor beeps when an electron passes through the slit. It is observed that the presence of the sensor at the slit does not change the pattern on the film for the single-slit experiment. The sensor is now placed at the left slit of the double-slit experiment. Both slits are uncovered and the experiment is repeated with new film. (As in the earlier experiment, one electron reaches the slits every ten seconds.) When the experiment is run for a sufficiently long period of time, it is observed that the sensor beeps for 50% of the electrons that arrive at the slits. A. Consider an instant immediately after the sensor at the left slit beeps. What is the probability that an electron has just passed through the right slit? Explain. B. Predict whether an electron that is detected passing through the left slit would be more likely to reach the film at point M or point N, as illustrated below. C. Predict the pattern that will appear on the film after a long time in the double-slit experiment when a sensor has been placed at the left slit. Explain your reasoning.

A sensor is placed at a slit in a single-slit experiment. The sensor beeps when an electron passes through the slit. It is observed that the presence of the sensor at the slit does not change the pattern on the film for the single-slit experiment. The sensor is now placed at the left slit of the double-slit experiment. Both slits are uncovered and the experiment is repeated with new film. (As in the earlier experiment, one electron reaches the slits every ten seconds.) When the experiment is run for a sufficiently long period of time, it is observed that the sensor beeps for 50% of the electrons that arrive at the slits. A. Consider an instant immediately after the sensor at the left slit beeps. What is the probability that an electron has just passed through the right slit? Explain. B. Predict whether an electron that is detected passing through the left slit would be more likely to reach the film at point M or point N, as illustrated below. C. Predict the pattern that will appear on the film after a long time in the double-slit experiment when a sensor has been placed at the left slit. Explain your reasoning.

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