This A Level Physics textbook covers all the requirements of the AS and A2 Physics specifications. This fifth edition has been updated to include: revisions to the content to reflect changing AS and A Level specifications; a new chapter on cosmology and astrophysics; revisions to text and photographs to ensure that examples are up-to-date; updated examination questions from recent past papers; samples of the use of spreadsheets and dataloggers; and the use of full colour throughout.