In the davisson- German experiment, if the scattering angle is 60°, then glancing angle is equal to

Options

A. 30°
B. 45°
C. 60°
D. 90°

Answer

To solve the problem, we need to find the glancing angle (θ) given the scattering angle (φ) in the Davisson-Germer experiment.

### Step-by-Step Solution:

1. **Identify the given angle**:
We know that the scattering angle (φ) is given as 60°.

2. **Understand the relationship between angles**:
The relationship between the scattering angle (φ) and the glancing angle (θ) in the Davisson-Germer experiment is given by the equation:
\[ 2θ + φ = 180° \]

3. **Substitute the known value**:
Substitute φ = 60° into the equation:
\[ 2θ + 60° = 180° \]

4. **Isolate the term with θ**:
To isolate 2θ, subtract 60° from both sides:
\[ 2θ = 180° - 60° \]
\[ 2θ = 120° \]

5. **Solve for θ**:
Divide both sides by 2 to find θ:
\[ θ = \frac{120°}{2} \]
\[ θ = 60° \]

Thus, the glancing angle (θ) is equal to 60°.

### Final Answer:
The glancing angle is 60°.