Questions

The human ear can respond to minute pressure variations inthe air if they are in the audible frequency range, roughly 20 Hz -20 kHz. In fact, tests conducted show an increased sensitivity in the 3000 Hz range which is the optimal amplification frequency in the human ear. So, the sensitivity of the human ear varies with the frequency of the sound.

Angelique Kerber is a German professional tennis player and former world No. 1, and a three time Grand Slam champion. Having made her professional debut in 2003, Kerber rose to prominence upon reaching the semifinals of the 2011 US Open as the No. 92 ranked player in the world. 

The Indian Navy commissioned the highly   manoeuvrable   fast   attack craft  INS  Tihayu  at  the  Eastern Naval   Command   on   19   October 2016.  The  ship  was  commissioned at  Visakhapatnam  under  the  Naval Officer-in-Charge (Andhra Pradesh) and  would  be  deployed  for  coastal patrol  and  surveillance  operations along the Eastern Coast.