When we nibble at a rusk, we hear a noise that is simply deafening. But for some reson, our neighbour makes hardly any noise though he is doing the samed. Why ?

Why don't we hear sounds when our ears are closed?

Why don't we hear sounds when our ears are closed?

We do not sense any pain when we clip our nails or cut our hair. Why?

Answer the following question:- Noise is a common problem in both urban and rural areas, traffic noise in particular. Trees and shrubs are not only visually attractive but also can make effective noise barriers. Therefore when space permits we have to plant more trees and shrubs in areas where there is noise problem. By doing this noise can be reduced by six decibels over a distance of 30 metres. The only thing we have to keep in mind is that the planting should be particularly dense, the trees which have dense foliage and relatively vertical orientation of arrangements should be planted. It will completely screen the source of noise. If there is any gap in barrier it will still allow noise to penetrate. Single layer of trees is worthless as a noise barrier. Due to inter-reflection, multi-rows of trees are more effective. "Single layer of trees is worthless as a noise barrier.' Why?

Answer the following question:- Noise is a common problem in both urban and rural areas, traffic noise in particular. Trees and shrubs are not only visually attractive but also can make effective noise barriers. Therefore when space permits we have to plant more trees and shrubs in areas where there is noise problem. By doing this noise can be reduced by six decibels over a distance of 30 metres. The only thing we have to keep in mind is that the planting should be particularly dense, the trees which have dense foliage and relatively vertical orientation of arrangements should be planted. It will completely screen the source of noise. If there is any gap in barrier it will still allow noise to penetrate. Single layer of trees is worthless as a noise barrier. Due to inter-reflection, multi-rows of trees are more effective. What distance a good number of trees can cover in reducing noise ?

In winter, if we touch steel chair , we feel cold but so when touched wooden chair , though both are at the same temperature. Why?

When we enter some dark room then for some time we are not able to see anything and rKHOaning there for long,if suddenly strong light is switched on then our eyes can not see anything why?

What is the reason that we burn out our body fat only when we walk briskly? Why does normal walking not burn out the same amount of body fat when the distance covered remains the same?