8th Class Science Sample Paper Science Sample Paper-3

  • question_answer
    An alarm bell is kept inside a vessel as shown in Fig. A person standing close to it can distinctly hear the sound of alarm. Now if the air inside the vessel is removed completely how will the loudness of alarm get affected for the same person?                                                                                                                                                    
     

    Answer:

    Initially, the person is able to hear the sound coming from air and from water distinctly. But after sometime, when the air is completely removed from the bottle, the sound will pass through the water and then the glass and finally reach to the man. So, the man will not hear the sound which was coming through the air initially.


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