First slide

Matter waves (DC Broglie waves)

Question

What will be the de Broglie wavelength of the electron in the first excited state of $H e^{+}$ ion?

Easy

A

6.6 $\overset{o}{A}$
B

3.3 $\overset{o}{A}$
C

13.2 $\overset{o}{A}$
D

1.65 $\overset{o}{A}$

Solution

$h ν = 3.3 \times \frac{n}{z} \overset{o}{A}$
$∴ when n = 2 and z = 2, λ = 3.3 \times \frac{2}{2} \overset{o}{A} = 3.3 \overset{o}{A}$

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