The table shows information about three electromagnetic waves travelling through a vacuum. Wave Wavelength / m Speed / m/s P 3.0 × 10−10 3.0 × 108 Q 5.0 × 1...
Question 1 Report
The table shows information about three electromagnetic waves travelling through a vacuum.
| Wave | Wavelength / m | Speed / m/s |
|---|---|---|
| P | 3.0 × 10−10 | 3.0 × 108 |
| Q | 5.0 × 10−7 | 3.0 × 108 |
| R | 2.0 × 10−2 | 3.0 × 108 |
Which wave is most likely to be visible light?
Answer Details
This question tests identifying visible light by its wavelength. The visible light spectrum spans approximately \( 4 \times 10^{-7} \) to \( 7 \times 10^{-7} \) m (400-700 nm).
- Wave P: \( 3.0 \times 10^{-10} \) m is in the X-ray range (much shorter than visible).
- Wave Q: \( 5.0 \times 10^{-7} \) m = 500 nm, which is green visible light. This is in the visible range.
- Wave R: \( 2.0 \times 10^{-2} \) m is in the microwave range (much longer than visible).
Wave Q is the only one with a wavelength in the visible range. All three travel at the same speed because they are all electromagnetic waves in a vacuum.
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