The number of waves in the third orbit of ` H -` atom is

Options

A. 1
B. 2
C. 4
D. 3

Answer

To find the number of waves in the third orbit of a hydrogen atom (H⁻), we can use the following steps:

### Step 1: Understand the Concept of Orbits
In atomic physics, the orbits of electrons in an atom are quantized. The principal quantum number (n) indicates the energy level of the electron. For the hydrogen atom, the third orbit corresponds to n = 3.

### Step 2: Use the Formula for the Number of Waves
The number of waves in the nth orbit can be calculated using the formula:
\[ \text{Number of waves} = n \]

### Step 3: Substitute the Value of n
For the third orbit, n = 3. Therefore, we can substitute this value into the formula:
\[ \text{Number of waves} = 3 \]

### Step 4: Conclusion
Thus, the number of waves in the third orbit of the H⁻ atom is 3.

### Final Answer
The number of waves in the third orbit of the H⁻ atom is **3**.

---