Question

If the angle of incidence is 30 degrees then the wave length for first order spectrum in terms of 'd' is equal to?

Answer 1

Answer:

no idea

so sorry

Explanation:

Answer 2

Answer:

The wavelength, λ, for the first-order spectrum measured is d.

Explanation:

Given,

The angle of incidence, $\theta$ = $30\textdegree$.

The wavelength for the first-order spectrum in terms of 'd' =?

The order of spectrum, n = 1

As we know,

• According to Bragg Equation;
• $n\lambda = 2d sin\theta$

Here,

• n = order
• λ = wavelength
• d = path difference

After putting the value of $\theta$ in the equation, we get:

• $n\lambda = 2d sin30\textdegree$
• $1\lambda = 2d \frac{1}{2}$                    ( $sin30\textdegree = \frac{1}{2}$ )
• $\lambda = d$

Hence, the wavelength for the first-order spectrum is d.