I am attaching a picture cause I cannot write it directly
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The distance from one crest to another crest or from one trough to another trough is called wavelength. Hope it helps
Answer: both compounds have ionic bond between metal and non-metal
Explanation: both Sr and Mg are earth alkaline metals and form ions Mg^2+
And Sr^2+. Br forms ion Br^- and S ion is S^2+.