There are two boxes A & B. Cell phones are kept in both the boxes, all

1.	There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because Statement 1: In box B there are air particles to vibrate but in box A there is vacuum Statement 2: Sound needs a medium for propagation
Answer» There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because Statement 1: In box B there are air particles to vibrate but in box A there is vacuum Statement 2: Sound needs a medium for propagation

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because Statement 1: In box B there are air particles to vibrate but in box A there is vacuum Statement 2: Sound needs a medium for propagation

Answer»

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because
Statement 1: In box B there are air particles to vibrate but in box A there is vacuum

Statement 2: Sound needs a medium for propagation

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