Almost everything that makes your life more comfortable, or allows you to work efficiently in the 21st century, is due to engineered solutions based on physical principles. For example, the discovery of electricity, magnetism, relativity and quantum mechanics came about through human curiosity; however, technologies based on these discoveries did not eventuate until much later.
The skills you gain through studying physics and astrophysics at Monash can be used in many areas, such as: developing medical instrumentation, radiotherapy treatment of cancer, modelling climate and weather, analysing big data and financial systems, developing innovative ways to address sustainability, exploring emergent behaviour in complex biological systems, and understanding the function of the brain.
https://www.monash.edu/science/schools/physics