Please help quick please its a test

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Which accurately compares concave and convex lenses?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?