Multiple choice question XV — task. Science CBSE, Class 9.

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1. Non-mechanical (electromagnetic) wave can propagate in:

material medium as well as vacuum
in vacuum, but not in material medium
in material medium but not in vacuum
neither in material medium nor in vacuum

2. The linear distance between a compression and a rarefaction or a crest and a trough is:

\(\frac{\lambda}{2}\)
\(\frac{\lambda}{4}\)
\(\lambda\)
\(\frac{3\lambda}{2}\)

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