A group of physicists are conducting an experiment involving the creation of a short-lived particle, Particle X, in a high-energy particle collider. Particle X decays almost instantaneously into two photons. Before its decay, the physicists measure the total energy of Particle X to be 8.5 × 10⁻¹⁰ J, and its velocity to be 0.866$c$, where $c$ is the speed of light.
c. Discuss how the measured kinetic energy of Particle X would differ if calculated using classical mechanics. Justify your answer.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Physics practice question worth 3 marks, testing your understanding of Mass-energy relation. It falls under How has understanding about the physical world changed? 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.
In this area of study, students learn how understanding of light, matter and motion have changed over time. They explore how major experiments led to the development of theories to describe these fundamental aspects of the physical world. Students consider the limitations of classical mechanics as they explore Einstein’s view of the Universe. They use special relativity to explore length contraction and time dilation as observations are made by observers in different frames of reference, and the interrelationship between matter and energy.
Interpret Einstein’s prediction by showing that the total ‘mass-energy’ of an object is given by: Etot = Ek + E0 = γmc², where E0 = mc², and where kinetic energy can be calculated by: Ek = (γ − 1)mc².
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