What is the de Broglie wavelength of a bullet of mass [tex]0.030 \, \text{kg}[/tex] traveling at [tex]540 \, \text{m/s}[/tex]? Planck's constant is [tex]6.63 \times 10^{-34} \, \text{J} \cdot \text{s}[/tex].

A. [tex]4.1 \times 10^{-35} \, \text{m}[/tex]
B. [tex]3.5 \times 10^{-35} \, \text{m}[/tex]
C. [tex]2.2 \times 10^{-34} \, \text{m}[/tex]
D. [tex]1.7 \times 10^{-34} \, \text{m}[/tex]



Answer :

Certainly! Let's solve the problem step-by-step.

### Step-by-Step Solution

1. Understand the De Broglie Wavelength Formula:
The de Broglie wavelength ([tex]\(\lambda\)[/tex]) can be calculated using the formula:
[tex]\[ \lambda = \frac{h}{mv} \][/tex]
where:
- [tex]\(h\)[/tex] is Planck's constant ([tex]\(6.63 \times 10^{-34} \, J \cdot s\)[/tex])
- [tex]\(m\)[/tex] is the mass of the object (in kg)
- [tex]\(v\)[/tex] is the velocity of the object (in m/s)

2. Given Data:
- Mass ([tex]\(m\)[/tex]) = 0.030 kg
- Velocity ([tex]\(v\)[/tex]) = 540 m/s
- Planck's Constant ([tex]\(h\)[/tex]) = [tex]\(6.63 \times 10^{-34} \, J \cdot s\)[/tex]

3. Substitute the Values into the Formula:
[tex]\[ \lambda = \frac{6.63 \times 10^{-34}}{0.030 \times 540} \][/tex]

4. Perform the Calculation:

First, calculate the denominator:
[tex]\[ 0.030 \times 540 = 16.2 \][/tex]

Then divide Planck's constant by this product:
[tex]\[ \lambda = \frac{6.63 \times 10^{-34}}{16.2} \approx 4.092592592592593 \times 10^{-35} \, \text{m} \][/tex]

5. Round to Significant Figures:
The answer [tex]\(4.092592592592593 \times 10^{-35} \, \text{m}\)[/tex] can be rounded to match the significant figures typically provided in such contexts. Hence, it is approximately [tex]\(4.1 \times 10^{-35} \, \text{m}\)[/tex].

### Conclusion
Hence, the de Broglie wavelength of the bullet of mass 0.030 kg traveling at [tex]\(540 \, \text{m/s}\)[/tex] is approximately [tex]\(4.1 \times 10^{-35} \, \text{m}\)[/tex].

The correct answer from the given options is:
[tex]\[ \boxed{4.1 \times 10^{-35} \, \text{m}} \][/tex]