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Yogita Ingle 5 years, 9 months ago
Flash and thunder are produced are produced simultaneously,but the flash is seen first and then the sound is heard.This is because the speed of sound in air is very less than the speed of light in air.
Speed of sound in air : 334ms⁻¹
Speed of light in air : 3X10⁸ms⁻¹
With the increase in Density of the medium, the speed of sound also increases.
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Work is said to be done whenever a force acts on a body and there is a displacement of the body caused by the applied force along the direction of the applied force.
Posted by Praveen Singh 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
Congential disease are inborn disease which are present from the birth these are inheritable disease.
In this many disease are come like , colour blindness ,heamophilia, colour blindness.are the some example of congential disease.
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Mass |
Weight |
| Mass can never be zero. | Weight can be zero. As in space if no gravity acts upon an object, its weight becomes zero. |
| Mass is a scalar quantity. It has magnitude. | Weight is a vector quantity. It has magnitude and is directed toward the center of the Earth or other gravity well. |
| Mass is commonly measured in kilograms and grams. | Weight is commonly measured in Newtons. |
| Mass doesn’t change according to location. | Weight varies according to location. |
| The mass may be measured using an ordinary balance. | Weight is measured using a spring balance. |
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Yogita Ingle 5 years, 9 months ago
A congenital disorder is an abnormality of structure or function in a person, which is present from birth. The congenital disorder may be clinically obvious at birth, or may only be diagnosed sometime later in life. For example, a neural tube defect is a structural defect which is obvious at birth while haemophilia, which is also present at birth, is a functional defect that may only become obvious and be diagnosed when the child is older. Congenital disorders often present as an abnormal appearance or failure to grow and develop normally.
Posted by G G Nagendran 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Molar mass: The molar mass is the mass of one mole (or 6.023 X 1023) particles of that substance. The molar mass of an element is equal to the numerical value of the atomic mass. However, in case of molar mass, the units change from ‘u’ to ‘g’. The molar mass of an atom is also known as gram atomic mass.
For example mass of 6.023 X 1023 atoms of sodium or molar mass of sodium is 23g, but its atomic mass is 23u
Calculation of molar mass: The molar mass of oxygen is equal to mass of one mole of oxygen. Oxygen forms a divalent molecule, so this is the mass of one mole of O2.
Atomic weight of oxygen atom = 16g
Molar mass of oxygen = 2 x 16.00 g = 32.00 g
Posted by Manchanda Brothers 5 years, 9 months ago
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Melting point
The constant temperature at which a solid becomes liquid upon absorbing heat under normal pressure is called as the melting point of that solid. [Pressure of 760 mm of Hg]
Melting point (Solid state → Liquid state)
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Yogita Ingle 5 years, 9 months ago
SONAR (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
In this method, to find the depth of an ocean, a strong ultrasonic wave is sent from the ship towards the bottom of the ocean. This ultrasonic wave is received back after it is reflected from the bottom of the sea. The time interval t for travel of sound waves from the source to the receiver after reflection is noted.The distance travelled by the ultrasound ray is given by the equation: 2d = vt, where v is the velocity of sound. From this the depth d can be calculated.
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Prerana Maan 5 years, 9 months ago
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