Assertion : Radio waves are diffracted by buildings
Reason : Radio waves are high energy waves.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

To analyze the assertion and reason provided in the question, we will break down the concepts step by step.

### Step 1: Understand the Assertion
The assertion states that "Radio waves are diffracted by buildings."

**Explanation:**
Radio waves are a type of electromagnetic wave with relatively long wavelengths (typically in the range of 1 meter to 100 kilometers). When these waves encounter obstacles like buildings, which are comparable in size to their wavelength, they can bend around the edges of the obstacle. This phenomenon is known as diffraction.

### Step 2: Understand the Reason
The reason states that "Radio waves are high energy waves."

**Explanation:**
The energy of electromagnetic waves is inversely related to their wavelength. The formula for energy (E) is given by:
\[ E = h \nu \]
where \( h \) is Planck's constant and \( \nu \) (nu) is the frequency of the wave. Since frequency and wavelength are inversely related (\( \nu = \frac{c}{\lambda} \), where \( c \) is the speed of light and \( \lambda \) is the wavelength), longer wavelengths correspond to lower frequencies and, consequently, lower energy. Radio waves have long wavelengths, which means they have low energy, not high energy.

### Step 3: Conclusion
- The assertion is **correct**: Radio waves can indeed be diffracted by buildings.
- The reason is **incorrect**: Radio waves are not high energy waves; they have low energy due to their long wavelengths.

### Final Answer
Thus, the correct conclusion is that the assertion is true, but the reason is false.