What is the distance between two successive crests or successive troughs called?

When light is scattered by a molecule and the frequency of the scattered light is changed, this phenomenon is called

X-rays can be used to : 1. inspect welded joints between two metal parts of a machine. 2. study structure of crystals. Select the answer using the code given below :

Which one of the following is used for determining the structure of crystal?

Which one of the following optical phenomena supports that the light is a transverse wave?

What is the name of the frequency range used for AM radio broadcasting?