The Amazing knowledge of universe

A true friend is one soul in two bodies."

WHY GRASS IS GREEN ?
according to science,
Chlorophyll is a pigment that allows plants to capture energy from the Sun in order to power the process of photosynthesis.
Given that most grasses lack trunks or woody stems like trees or shrubs, their aboveground bodies are mostly chlorophyll-rich leaves and stems, and, thus, the part you see is all green.
We are able to see objects because of the light reflected from them is perceived by our eyes. Objects absorb certain wavelengths and reflect the other. It is the color of the reflected wavelengths which imparts color to the objects. Now, grass absorbs the other colors of light and reflects green light. This green light reaches our eyes when we look at grass. Thus grass is green.

Ghulam Mustafa,
Sindh University Jamshoro dep; of Physics

Why do we swing our arms when we walk?

We move our hands while walking is a natural motion where in each arm swings with the motion opposite that of the leg.Moving arms in an opposing direction with respect to the lower limb reduces the angular momentum of the body which helps in balancing the rotational motion produced during walking.

"According to Physics"

the swinging leg uses muscle force to move forward and immediately relaxes, allowing the force of gravity to move it to the ground.
When a person walks he pushes the ground or earth backward with his foot. Hence the force of friction acts in the forward direction i.e.. in a direction in which the we walks.

Ghulam Mustafa Magsi (Student of Physics )

Shocking Side Effects of Earphones On Our Brain and Ears!

When the sound is too loud and played for a long time, the hearing cells in the ear can get damaged. On top of that, the earphones may push the wax in the ear further into the ear canal which can cause infections as well

Hearing Loss: As mentioned above, loud music or long exposure tends to make the hair cells bend down too much and severely, the extent of which can lead to temporary or permanent hearing loss. Dizziness: Many times, the increased pressure in the ear canal due to loud noise can also result in dizziness.

Some of the harmful ways in which earphones can affect our ears are:

NIHL(Noise-Induced Hearing Loss)

Tinnitus.

Hyperacusis.

Hearing loss.

Dizziness.

Ear infection.

Excessive ear wax.

Pain in the ears.

Ghulam Mustafa ; Student of Physics

Using a mobile phone in the dark at night is harmful for human ;

The blue light emitted by your cell phone screen restrains the production of melatonin, the hormone that controls your sleep-wake cycle (aka circadian rhythm). This makes it even more difficult to fall asleep and wake up the next day.
Scientists have uncovered that blue light emission from your smart phone screens may seem harmless but may be toxic to the eyes and causing macular degeneration, a leading cause of vision loss in the US.

Ghulam Mustafa : Student of Physics

Water has three different forms !

water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful and essential of compounds.
Water can occur in three states:

1; Solid (ice),
2; Liquid
3; Gas (v***r).

1》 Solid water – ice is frozen water. When water freezes, its molecules move farther apart, making ice less dense than water. This means that ice will be lighter than the same volume of water and so ice will float in water.

2》A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds. Like a gas, a liquid is able to flow and take the shape of a container.

3》The gaseous state of atmospheric water is termed water v***r or simply v***r.

Ghulam Mustafa ;Student of Physics.