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2021-08-27 19:16:04 CHEMISTRY

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2021-08-27 11:13:26 Properties of Cathode Rays
(i) Cathode rays are not electromagnetic rays.

(ii) Cathode rays are deflected by electric field and magnetic field.

(iii) Cathode rays produce heat in metals when they fall on them.

(iv) Cathode rays can pass through thin aluminium or gold foils without puncturing them.

(v) Cathode rays can produce physical and chemical change.

(vi) Cathode rays travel in straight line with high velocity
momentum and energy and cast shadow of objects placed in
their path.

(vii) On striking the target of high atomic weight and high melting point, they produce X-rays.

(viii) Cathode rays produce fluorescence and phosphorescence in
certain substance and hence affect photographic plate.

(ix) Specific charge of an electron was determined by JJ Thomson using perpendicular magnetic and electric field applied on a beam of electrons, at the same place.

(x) Specific charge of electron e/m = E^2/V^2B^2 where, E = electric field, B = magnetic field and V = potential difference applied across ends of tube.

(xi) The value of specific charge of an electron is1.7589 ×10^11 C/kg. Open / Comment

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2021-08-26 21:32:06 Human Brain

Introduction
The brain of a human being is the central organ of the nervous system.
The human brain consists of three parts namely the cerebrum, the brainstem and the cerebellum.
The brain of a human being plays significant role, as it controls most of the activities of the human body.
The brain is located inside the head, and protected by the skull bones.
The brain consists of more than 86 billion neurons and almost equal number of other cells as well.
Brain activity is made possible because of the interconnections of all the neurons that are linked together.
The study of brain functions is known as neuroscience.
An adult human brain weighs about 1.2 to 1.4 kg (i.e. average weight); which is about 2% of the total body weight.

Parts of Human Brain
A human brain is primarily classified as the −
➭ Forebrain
➭ Midbrain
➭ Hindbrain
Forebrain is largely made up of cerebrum, thalamus, hypothalamus and pineal gland.
Midbrain is largely made up of a portion of the brainstem.
Hindbrain largely made up of the remaining brainstem, cerebellum and pons.
Further, the (brain) hemisphere is conventionally classified into four lobes namely −
➭ Frontal lobe
➭ Parietal lobe
➭ Temporal lobe
➭ Occipital lobe
The naming is done according to the skull bones that overlie them.

Cerebrum
Divided into nearly symmetrical left and right hemispheres by a deep groove, the cerebrum is the largest part of the human brain.
Cerebrum normally controls higher brain functions including language, logic, reasoning, and creativity.

Functions of Human Brain
Perceive or sense the signal coming from the (external) environment
Giving sense of feelings and emotion
Regulating and controlling the human behaviors
Regulating and controlling the physical action
Regulating the memory function
Process of thinking (and other cognitive process)

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