Which statement best explains why scientific models, such as the atomic model, are modified or replaced over time?
New experimental evidence or observations are discovered that the existing model cannot explain.
Older models automatically expire after a set period of time.
Scientists are required to regularly change models to maintain their funding.
Newer models are always simpler and easier to understand than older models.
47 exam-style questions on OCR GCSE Physics Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.