Name two physical quantities which are imparted by an em wave to a surface on which it falls.

Explanation

To answer the question, we need to identify two physical quantities that an electromagnetic (EM) wave imparts to a surface when it falls on it.

### Step-by-Step Solution:

1. **Understanding EM Waves**: Electromagnetic waves carry energy and momentum. When they interact with a surface, they can transfer these properties to that surface.

2. **Energy Transfer**: The first physical quantity that an EM wave imparts to a surface is **energy**. When an EM wave strikes a surface, it can transfer its energy to that surface. This energy can cause various effects, such as heating the surface or causing electrons to be emitted from it (photoelectric effect).

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