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Meghna Thapar 5 years, 7 months ago
The bouncing back of sound when it strikes a hard surface is called reflection of sound. Hard, solid surfaces are the best for reflecting sound waves like a wall, metal sheet, etc.
The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface, and the three are in the same plane.
Posted by Avinash Sharma 5 years, 7 months ago
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Posted by #Technical Vedant Patidar 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
- The number of protons and neutrons combined to give us the mass number of an atom. It is represented using the letter ‘A.’
- As both protons and neutrons are present in the nucleus of an atom, they are together called nucleons.
- For example, an atom of carbon has 6 protons and 6 neutrons. Thus, its mass number is 12.
Posted by Naina Choudhary. 5 years, 7 months ago
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Posted by Naina Choudhary. 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Laws of constant proportion
The law states that in a chemical substances the elements are always present in a definite proportion by mass. It is also termed as law of definite proportion.
For instance, the ratio of hydrogen and oxygen in water obtained from any source is 1:8 i.e. 1g of hydrogen and 8g of oxygen together make up 9g of water.
Posted by Aarti Singh 5 years, 7 months ago
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Posted by Rishita Shah 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Chromosomes are thread-like structures woven together. Chromosomes are a lot like these thread-like structures, although a lot less flamboyant. They are located inside the nucleus of animal and plant cells.
Posted by Swayam Jain 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Fungi is a eukaryotic organism that includes microorganisms such as yeasts, moulds, and mushrooms.
Posted by Palak Gupta 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Tyndall effect can be defined as the scattering of a beam of light by colloidal particles present in a colloidal solution. The copper sulphate crystals are highly soluble in water and they form a true solution in water. Their particles size is very small so they do not scattering beam of light and does not show Tyndall effect.
Posted by Shereeya Patial 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The energy possessed by a body because of its position or configuration is known as potential energy.
- Potential Energy of An Object At A Height:
Suppose a body of mass m is raised to a height h above the surface of the earth. The force acting on the body is the gravitational pull of the earth m x g which acts in the downward direction. To lift a body above the surface of the earth, we have to do work against this force of gravity.
Work done = Force x Distance
So, W = m x g x h
This work gets stored up in the body as potential energy.
Thus, potential energy = m x g x h
Where m is the mass of the body, g is acceleration due to gravity; h is the height of the body above the reference point.
Posted by Shejan Lakhani 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
The ears are the sense organs which help us in hearing sound. It consists of three compartments – outer ear, middle ear and inner ear.
- The outer ear consists of a broad part called pinna having a long passage called ear canal. At the end of the ear canal is a thin, elastic and a circular membrane called ear drum. It is also called tympanum. The outer ear contains air.
- The middle ear contains three small and delicate bone called hammer, anvil and stirrup. These bones are linked to one another. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
- In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.
Posted by Naina Choudhary. 5 years, 7 months ago
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Posted by Narendar Beria 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Sound waves are mechanical waves because a need a material medium for their propagation. Sound waves cannot travel through vacuum but light waves and radio waves can travel through vacuum.
Posted by Bhola Bhandari 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
- Atoms that have the same number of protons but a different number of neutrons are called isotopes.
- In other words, isotopes have the same atomic number, but different mass numbers.
- Since they have the same number of protons, isotopes are different forms of the same element.
Three naturally existing isotopes of hydrogen are tritium, deuterium, and protium.
Posted by Rashmi Banjare 5 years, 7 months ago
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Posted by Mini Pawar 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 1023
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Lillima Amit 5 years, 7 months ago
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