Academic session 2026-27, Chapter 10 in the current curriculum.
Welcome to the NCERT Solutions for Class 9 Science - Chapter Sound. This page offers a step-by-step solution to the specific question from Exercise 0, Question 12:
A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.
. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.
If the time gap between the original sound and reflected sound received by the listener is around 0.1 s, only then the echo can be heard.
Speed of sound in air, v=344 m/s
The minimum distance travelled by the reflected sound wave for the distinctly listening the echo = velocity of the sound x time interval
= 344 x 0.1 => 34.4 m
But in this situation, the distance travelled by the sound reflected from the building and reaching to the girl will be (6 + 6 = 12 m). Therefore no echo will be heard by the girl.
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
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Welcome to the NCERT Solutions for Class 9 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 12: A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it the....
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