A group of students is designing an experiment to test the validity of the inverse square law for light intensity. They hypothesize that the intensity of light from a small, ideal point source decreases proportionally to the inverse square of the distance from the source. Their experimental setup involves a light sensor, a small LED (approximated as a point source), and a meter stick. They plan to measure the light intensity at various distances from the LED and compare the results with the theoretical prediction.
c. Discuss how the students could use the concept of uncertainty to assess the reliability of their data and evaluate the extent to which their experimental results support or refute the inverse square law. Your discussion should include consideration of both random and systematic uncertainties.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Physics practice question worth 4 marks, testing your understanding of Nature of evidence. It falls under How is scientific inquiry used to investigate fields, motion or light? in Unit 4: How have creative ideas and investigation revolutionised thinking in physics?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
A complex interplay exists between theory and experiment in generating models to explain natural phenomena. Ideas that attempt to explain how the Universe works have changed over time, with some experiments and ways of thinking having had significant impact on the understanding of the nature of light, matter and energy. Wave theory, classically used to explain light, has proved limited as quantum physics is utilised to explain particle-like properties of light revealed by experiments. Light and matter, which initially seem to be quite different, on very small scales have been observed as having similar properties. At speeds approaching the speed of light, matter is observed differently from different frames of reference. Matter and energy, once quite distinct, become almost synonymous. In this unit, students explore some monumental changes in thinking in Physics that have changed the course of how physicists understand and investigate the Universe. They examine the limitations of the wave model in describing light behaviour and use a particle model to better explain some observations of light. Matter, that was once explained using a particle model, is re-imagined using a wave model. Students are challenged to think beyond how they experience the physical world of their everyday lives to thinking from a new perspective, as they imagine the relativistic world of length contraction and time dilation when motion approaches the speed of light. They are invited to wonder about how Einstein’s revolutionary thinking allowed the development of modern-day devices such as the GPS. A student-designed practical investigation involving the generation of primary data and including one continuous, independent variable related to fields, motion or light is undertaken either in Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 2. The design, analysis and findings of the investigation are presented in a scientific poster format.
Students undertake a student-designed scientific investigation in either Unit 3 or Unit 4, or across both Units 3 and 4. The investigation involves the generation of primary data relating to fields, motion or light. The investigation draws on knowledge and related key science skills developed across Units 3 and 4 and is undertaken by students in the laboratory and/or in the field. The design, analysis and findings of the investigation are presented in a scientific poster format. A logbook is maintained by the students for record, assessment and authentication purposes.
Discuss the nature of evidence that supports or refutes a hypothesis, model or theory.
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