Calculate de Broglie wavelength for an average helium atom in a furnace at 400 K. Given mass of helium`=4.002`amu.

Explanation

To calculate the de Broglie wavelength for an average helium atom in a furnace at 400 K, we will follow these steps:

### Step 1: Understand the de Broglie wavelength formula
The de Broglie wavelength (\( \lambda \)) is given by the formula:
\[ \lambda = \frac{h}{mv} \]
where:
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