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explain increase in sound wave pressure through middle earthere are certain factors which contribute to an approximately eighty-fold increase in
define the ear canalthe other part of the outer ear is the ear canal the ear canal which conveys the sound to the eardrum is a rather tortuous canal
moisture from breathingmoisture coming from breathing might be shown by blowing on a cool mirror or into a cool glass or
moisture comes from other plantssecure a flower pot which has some bean or pea seedlings that are 10 or 15 cm in height cover the top of the pot with
moisture comes from home plantsplace a cellophane bag over a leaf of some house plant or garden plant and close the end about the stem with a rubber
moisture evaporates from soilfill a flower pot with moist soil and place it on a pair of scales either balances the pot of soil with weights or
weighing moisture againthe similar experiment can be done with a bath towel wet the towel and wring it out hang it on a coat hanger hang the coat
the mop weighs lessput a floor mop in water wring it out and then balance it on a triangular file placed on the corner of a table be sure you have it
define the term belbel the unit of measurement of sound is named after alexander graham bell bell was the inventor of the telephone but for some
another way to show that air expands when heatedsnap a toy balloon over the neck of a small bottle and place the bottle in a pan of warm
air expands when heatedto show that air expands when heated fit an electric light bulb flask or a bottle with a single- whole stopper or cork which
define the term amplitudein simpler terms amplitude is the amount or relative value of a signal amplitude is measured in units of pressure eg
define the nature of soundthis section is a recapitulation of what you have learnt in school you would recall that sound waves consist of the
explain the process of hearingthe ears as we all know are sense organs for hearing the ear consists of an external ear a middle ear and an internal
making a housing box for weather instrumentssome of your weather instruments must be uncovered to the weather between these are the wind vane the
a weather picturea piece of white blotting paper is immersed in a solution having two parts cobalt chloride to one part common salt while wet the
explain the complex cells - primary visual cortexthey are sensitive to both orientation and movement for example a line or edge with a particular
explain the simple cells - primary visual cortexthey are most sensitive to lines oriented in a particular angle to the vertical simple cells probably
define ishiharas charts - colour blindnesscolour blindness is often assessed using ishiharas charts if ever you visited an eye specialist you too
explain the monochromates or total colour blindnessthe monochromate individuals lack all cone pigments and cannot distinguish colours at all they
a weather housechanges in the amount of water vapour are in the atmosphere can be indicated by variation in tension in a few strands of human hair or
explain the dichromates or mild colour blindnessa dichromate individual possesses only two cone pigments lack of the red pigment called protanopia
a hair hygrometerthis device will enable you to read the relative humidity directly without the use of tablesprocure a few human hairs about 30 cm
explain the colour blindnessnormal individuals possess three cone pigments viz red green and blue which are referred to as tri-chromates colour
define the factors that are affecting colour perceptionthe two most important factors which influence colour perception include temperature and