Unpleasant sounds are called noise.Excessive or unwanted sounds lead to noise pollution. Noise pollution may cause health problems for human beings. Attempts should be made to minimise noise pollution.
Plantation on the roadside and elsewhere can reduce noise pollution. Normally noise which is less than 115 dB is tolerable (for a shorter period) We can reduce noise Pollution by following mentioned Tips: Turn off Appliances at Home and offices. Shut the Door when using noisy Machines. Use Earplugs. Lower the volume. Stay away from …
Hearing ImpairmentTotal hearing impairment, which is rare, is usually from birth itself. Partial disability is generally the result of a disease, injury or age. Children withimpaired hearing need special care. By learning sign language, such children can communicate effectively. Because speech develops as the direct result of hearing, a child with a hearing loss may …
Do you know that presence of excessive noise in the surroundings may cause many health related problems. Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution. A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing.
Sound waves with frequencies higher than 20000 Hz of human hearing are called ultrasound. This is used in many different fields such as navigation, medicine, imaging, cleaning, mixing, communication, testing etc. Even in nature, bats use this particular technique for the location of prey and obstacles.
Sound waves whose frequencies are less than 20 Hz are in the infrasonic sound. e . g earthquakes, thunder, volcanoes , elephants and whales etc.
Musical sound is one which is pleasing to the ear. e g Sound produced by a harmonium is a musical sound. The string of a sitar also gives out a musical sound.
unpleasant sounds are called noise. e g Classroom
Some animals can hear sounds of frequencies higher than 20,000 Hz. that is called Ultrasonic sound wave .Dogs have this ability. The police use high frequency whistles which dogs can hear but humans cannot.The ultrasound equipment, familiar to us for investigating and tracking many medical problems, works at frequencies higher than 20,000 Hz.
Audible and Inaudible SoundsThe fact is that sounds of frequencies less than about 20 vibrations per second (20 Hz) cannot be detected by the human ear. Such sounds are called inaudible. On the higher side, sounds of frequencies higher than about 20,000 vibrations per second (20 kHz) are also not audible tothe human ear. Thus, …
