https://file.aiquickdraw.com/mathbot/file/1726515951671n1lue04g.pdf

The document you uploaded contains various physics problems, specifically related to **progressive and stationary waves**. Let's go over the question regarding **percentage uncertainty in distance PQ**:

The problem states:

- The absolute uncertainty in identifying any minimum current is **± 0.2 cm**.
- The distance **PQ** is measured to be **50.9 cm**.

We need to calculate the percentage uncertainty in PQ, using the formula:

\[
\text{Percentage uncertainty} = \left( \frac{\text{Absolute uncertainty}}{\text{Measured value}} \right) \times 100
\]

Substituting the given values:

\[
\text{Percentage uncertainty} = \left( \frac{0.2}{50.9} \right) \times 100
\]

Let me calculate that for you.The percentage uncertainty in the distance PQ is approximately **0.39%**.

Would you like more details on this or any other part of the problem? Here are some related questions for further practice:

1. What is the frequency of the microwaves produced by the transmitter in this setup?
2. How do stationary waves differ from progressive waves?
3. Why does rotating the microwave detector by 90° result in zero current?
4. How is the wavelength of the microwaves related to the positions of the maxima and minima detected?
5. What is the significance of the error bars in graph-based measurements?

**Tip:** When measuring small distances with high precision, always account for the instrument's resolution to estimate uncertainty accurately.

Determine the percentage uncertainty in the distance PQ, given that the absolute uncertainty in identifying any minimum current is ± 0.2 cm and the distance PQ is measured to be 50.9 cm.

Learn how to calculate the percentage uncertainty in the distance PQ (50.9 cm) given an absolute uncertainty of ±0.2 cm. This problem involves key error calculation techniques suitable for A-level physics students.

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