Sound takes 5.0 seconds at 22 °C and approximately 5.196 seconds at 0 °C to cover 1720 meters. Subtracting these values reveals an extra transit time of roughly 0.20 seconds.
CBSE Class 9 Science Chapter 10 Sound Waves Characteristics and Applications Solutions
NCERT Class 9 Science Exploration Chapter 10 Question Answer
At 22 °C, dividing 1720 meters by 344 meters per second gives a transit time of 5.0 seconds. When the temperature drops to 0 °C, dividing 1720 meters by 331 meters per second yields approximately 5.196 seconds. Subtracting the two transit times shows that the sound of thunder takes roughly 0.20 seconds of extra time to arrive.
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