Give scientific reasons.(a) In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.(b) The sounds generated by a tabla and a sitar are different.(c) If you were both on the moon , your friend will not be able to hear you call.(d) We can hear the movement of a mosquito's wings but we cannot hear the movement of our hands.

Give scientific reasons.(a) In earlier times, people used to listen f

1.	Give scientific reasons.(a) In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.(b) The sounds generated by a tabla and a sitar are different.(c) If you were both on the moon , your friend will not be able to hear you call.(d) We can hear the movement of a mosquito's wings but we cannot hear the movement of our hands.
Answer» Give scientific reasons. (a) In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail. (b) The sounds generated by a tabla and a sitar are different. (c) If you were both on the moon , your friend will not be able to hear you call. (d) We can hear the movement of a mosquito's wings but we cannot hear the movement of our hands.