An instrument comprising four lightweight metal vanes, black on one side and white on the other, mounted on a spindle inside a partially evacuated…
| 单词 | θ76801 |
| 释义 | the world > matter > physics > science of sound > [noun] > instrument measuring intensity (4) radiometer1905 An instrument comprising four lightweight metal vanes, black on one side and white on the other, mounted on a spindle inside a partially evacuated… Rayleigh disc1913 a lightweight disc suspended by a fine thread so that when it is placed at an angle to incident sound waves their intensity can be calculated from… sound meter1928 an instrument for measuring the intensity of sound. Subcategories:— unit comparing intensities (1) |
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