People often cup their hands behind the ears

Dear Student

Your statement of question is not complete. I request you to please post complete question in near future, so that we can help you in batter way possible.
However, i am providing you a solution just based on that statement, by assuming "why" to this statement. 
Hope it will help you. Looking forward to hear from you again
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We can hear what’s going on around us, but our ears are designed to block out a lot of the sound that we actually make, as the sound we make is usually formed inside our head.  This causes us hear ourself differently to how people really hear us.

When we see a singer with one hand up to their ear. By cupping our hand from our mouth to our ear  and singing / speaking, we can hear ourself much clearer and how we actually sound.  This means we can check that we are singing in tune with one ear, whilst listening to the other voices or instruments with the other ear.

We can also taken an example for this like, 

Why do people tend to cup their hands around listeners' ears when whispering to them

In solids, sound travels faster because in solids the molecules are much more closer to each other as compared to liquids and gases.
Hence, distance between molecules is the minimum in solids and sound passes from one molecule to another easily.
Thus, we can conclude that people tend to cup their hands around listeners' ears when whispering to them because solid objects, such as a cupped hand, can direct sound waves into the ear of the listener.  

Regards

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