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प्रश्न
For hearing the loudest ticking sound heard by the ear, find the angle x in Fig.12.4.
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उत्तर
For hearing the loudest ticking sound, the angle made by incident sound with normal = angle made by reflected sound wave with normal = x
Now, the angle made by incident sound with normal
= 90° – 50°
= 40°
∴ x = 40°
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संबंधित प्रश्न
What is the range of frequencies associated with ultrasound?
Can we hear (a) infrasonic waves (b) ultrasonic waves ?
What type of sound waves are produced by a vibrating simple pendulum ?
Choose the infrasonic waves and ultrasonic waves from the following frequencies :
(i) 10,000 Hz
(ii) 30,000 Hz
(iii) 18 Hz
(iv) 50,000 Hz
(v) 10 Hz
Which of the following sound frequencies cannot be heard by a human ear ?
(i) 10 Hz
(ii) 100 Hz
(iii) 10,000 Hz
(iv) 15 Hz
(v) 40,000 Hz
What is ultrasound ? What is the difference between ordinary sound and ultrasound ?
What are infrasonic waves ? Name two animals which produce infrasonic waves.
What are ultrasonic waves ? Name two animals which can produce ultrasonic waves.
Which of the above two graphs (a) and (b) (Fig.12.3) representing the human voice is likely to be the male voice? Give a reason for your answer.
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 the 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.
