Question

please Answer this question .

Std: 9th
Subject: Science and technology ​

Answer 1

Answer:

answer should be A

Explanation:

To hear the sound clearly angle of incidence should be equal to angle of reflection and from the picture it is in the figure A

Answer 2

Answer:

☆● Arrangement of tube A in option ( A ) is correct to hear the sound clearly from tube B.

● As per law of reflection of sound :-

= The angle of reflection is always equal to the angle of incidence.

● In the first case :-

• Angle of Incidence = 45°

• Angle of Reflection = 45°

☆● Therefore arrangement in option ( A ) is correct to hear the clearly.

● Hope it helps you✌❤