hearing problem and define each problem

The immediate and acute effect of noise pollution is impairment of hearing. Damage to the eardrum can be caused by impulsive loud sounds or by prolonged exposure to noise. Long exposure to loud noise may result in hearing loss which may become permane..

Range of Hearing - Sound waves are emitted from a vibrating source and transmitted through air. The human ear can hear sound waves in the range 20 Hz and 20 KHz. This range is known as audible range. The sound waves having frequencies above the audible range are known as ultraso..

Mechanism of Hearing - The sound waves are directed towards the ear canal by the pinna. The waves that enter the canal are concentrated and made to strike against the tympanum. The vibrations are picked up by the malleus on the other side. These vibrations are transmitted to the fenestra ..

The sound waves are directed towards the ear canal by the pinna. The waves that enter the canal are concentrated and made to strike against the tympanu..

: It is a device used by the people who are hard of hearing. Here the sound waves, which are received by the hearing aid are reflected into a narrower area leading to the ea..

Problems - 1. The electrode potentials A, B, C and D are 2.52 V, -0.16V, + 1.3V and 3.01V respectively. On the basis of this name the following: a) Most electro positive ----------> D b) Most electro negative -----------> C c) Highest reducing power -----------> D d) Highest oxid..

6. Calculate the wavelength of the spectral line when the electron in the hydrogen atom undergoes a transition from 4 t h energy level to 2 n d energy level. What is the colour of the radiatio..

3. A radio station broadcasts on a frequency of 980 kHz (kilohertz). What is the electromagnetic radiation broadcasted by the radio statio..

5. Calculate the energy of a photon of light having frequency of 3.0 x 10 1 5 sec - 1 (Planck's constant h = 6.63 x 10 - 3 4 J..

4. Represent the formation of phosphorus trichloride in terms of Lewis structur..