Electromagnetism -- What do charges have to do to create EM waves?

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Homework Statement
electromagnetic waves are produced by electric charges that change........in some way.
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I am not sure, but I think the answer is between acceleration and velocity.
 
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Is there a question here?
 
Yes is the answer acceleration or velocity.
 
bbbbb said:
Yes is the answer acceleration or velocity.
But what is the question?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

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