Question
Write down the difference between the sound and light waves.
| Sound | Light |
| 1. Medium is required for the propagation | 1. Medium is not required for the propagation. |
| 2. Sound waves are longitudinal. | 2. Light waves are transverse. |
| 3. Wavelength ranges from 1.65 cm to 1.65 m. | 3. Wavelength ranges from $4 \times 10^{-7} m$ to 7 to 1.65 m . |
| 4. Sound waves travel in the air with a speed of about $340 ms^{-1}$ at NTP. | 4. Light waves travel in the air with a speed of $3 \times 10^8 ms^{-1}$ |
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