Scientists of all disciplines make use of the ideas of physics including chemists and biologists. The space travel, mobile computing and 3D experience were made possible with application of principles or laws of physics in engineering and technology. Semiconductors which led to the invention of the transistor, and then the whole science of solid state electronics, now dominate our communications and computer technology. Lasers find many applications in spectroscopy, industry, medical and defensive countermeasures. It would be a great break through for clean energy if we can create plasma of certain light elements such as hydrogen isotopes and make the system hot enough to produce nuclear fusion reactions.
Even though chemistry is now being explained in terms of electromagnetic forces and quantum theory and biology is beginning to derive valuable insights from the application of basic physical principles, physics is primarily concerned with understanding the universe, its constituent particles and their interactions at the most primitive level. Observe nature through eyes of physics, grasp the laws of nature, identify similarities and develop insight to be able to apply what you have learnt in finding solutions to challenges in making the world a better place to live.