The first of these are oscillations in the total density of photons (i.e., density mode), while the second relates to the difference between its two underlying components (i.e., spin mode).

However, this is an expression for the density of air that will be close enough. With this density model, I find that at sea level the density of air is about 1.22 kg/m 3 compared to 0.98 kg/m 3 ...

For on-the-go revision, BBC Bitesize and BBC Sounds have produced a series of GCSE revision podcasts, covering a range of GCSE physics themes. Listen to the energy series for more on this topic.

That’s not enough physics for you to actually go on a scuba dive, but it's enough to give you a sense of what's going on. If you’d like to try it out, a dive instructor at a scuba shop can ...

ICSE Class 10 Physics Exam 2023: The Council for the Indian School Certificate Examinations (CISCE) is one of the most esteemed and popular school boards in India and holds the annual term-end ...