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Why are sound waves called as mechanical waves

Posted by Vandhana Joytika 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Sound waves are called mechanical waves because they need a medium to travel through.

Electromagnetic waves can travel through space(without medium), whereas sound waves cannot.

Sound waves always do need a medium, the medium can be different like air, water, metal(solid), but the presence of medium is a must for sound waves that is why they are called mechanical waves.

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Differencate between sclerenchyma and parenchyma tissue

Posted by Shanul Saifi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Parenchyma	Sclerenchyma
It is made up of cells having very thin cell wall.	They are made up of cells having thick cell wall.
The cells are loosely packed.	No intercellular spaces present between them, cells are tightly packed.
The cell wall is made up of cellulose.	The cell wall is made up lignin.
It is found in abundant. Most of the plant tissues are made up of parenchyma cells.	The outer woody stem portion of large trees is made up of sclerenchyma cells.
it constitutes living cells.	Matured cells are dead.

ANSWER

A substance x reacts vigorously with water to produce a new substance y releasing to produce a new substance y releasing a large amount of heat. Find x and y. Also the chemical reactions involved. Write the type alos

Posted by Shreya Kumari 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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Give me daltons atomic theory

Posted by Nidhi Jhamb 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Dalton’s atomic theory can be explained as follows:

1) Matter is made up of atoms. Atoms are indivisible and indestructible.

2) All atoms of a certain element are identical in mass and properties.

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

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10 year previous paper send please

Posted by Ujjwal Ujjwal 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are lichens.

Posted by Aniket Sriva7563 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Siddesh Lohkare 7 years, 1 month ago

Lichens are the green algae which come under plantae. They usually grow on stem of the plants where there is less pollution. The lichens and fungi together make a symbiotic relationship

Rizul Dulat 7 years, 1 month ago

Symbiotic association between algae and fungi

ANSWER

What is dalton theory

Posted by Manpreet Singh 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

The main postulates of Dalton’s atomic theory (Dalton 1808) are:

1. Matter is made up of very small indivisible particles called atoms.
2. Atoms of the same element are identical in all respects.
3. Atoms of different elements differ in properties and mass.
4. Atoms combine in a simple but fixed ratio to form compound atoms (now called molecules).
5. Atom is the smallest particle which can take part in a chemical reaction.
6. Atom can neither be created nor destroyed during a chemical reaction.
7. Atoms of two elements may combine in different ratios to form more than one compound.

ANSWER

How many years a snake can be live?

Posted by Gurtej Hundal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Crazy Boy 7 years, 1 month ago

ANSWER

Diversity in living organisms me animalia flow chart

Posted by Adarsh Shukla 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Rinki Barnwal 7 years, 1 month ago

1 .porifera

ANSWER

Why work is a scalar quantity since it has a direction also?

Posted by Aaditya Jain 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Siddhartha Saraiwal 7 years, 1 month ago

Because the product of two vector quantitys is scaler

6Thank You

Ankit Yadav 5 years, 11 months ago

Because work=f×s and s is displacement which is a vector quantity

3Thank You

ANSWER

Difference between speed and velocity ?

Posted by Mehak Sharma 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

<th>BASIS FOR COMPARISON</th> <th>SPEED</th> <th>VELOCITY</th>

Meaning	Speed refers to the distance covered by an object in unit time.	Velocity refers to the displacement of the object in unit time.
Determines	How fast something is moving?	In which direction something is moving?
Quantity	Scalar quantity	Vetor quantity
Indicates	Rapidity of the object.	Rapidity and position of the object.
Rate of	Change of distance	Change of displacement
When the body returns to its initial position	Will not be zero	Will be zero
Moving object	Speed of moving object can never be negative.	Velocity of moving object can be positive, negative or zero.

4Thank You

ANSWER

Applications of inertia

Posted by Babulal Choudhary 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

All objects resist a change in their state of motion. The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called inertia. This is why, the first law of motion is also known as the law of inertia. We tend to remain at rest with respect to the seat until the drives applies a braking force to stop the motorcar. With the application of brakes, the car slows down but our body tends to continue in the same state of motion because of its inertia. A sudden application of brakes may thus cause injury. Safety belts are worn to prevent such accidents as they exert a force on our body to make the forward motion slower. When we are standing in a bus and the bus begins to move suddenly we tend to fall backwards because the sudden start of the bus brings motion to the bus as well as to our feet in contact with the floor of the bus. But the rest of our body opposes this motion because of its inertia.

When a motorcar makes a sharp turn at a high speed, we tend to get thrown to one side due to the law of inertia. We tend to continue in our straight-line motion.

ANSWER

How sonar produces multiple refraction

Posted by Ishaan Sharma 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Ishaan Sharma 7 years, 1 month ago

Through rerefraction or reflection

ANSWER

Why are striated muscles also called volintaty and keletal muscles

Posted by Ashok Yadav 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Shreyas Joshi 7 years, 1 month ago

Stratiated muscles are called skeletal as they are joint to bones and are also called vounteery as they function when we/our brain suppose them to

ANSWER

What's is kinetic energy

Posted by Sahil Sahil 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Shreyas Joshi 7 years, 1 month ago

Kinetic energy is the energy obtained by a body by virtue of its motion

Khushi Ahlawat 7 years, 1 month ago

The energy possed by the body due its motion is called kinetic energy

Rushali Popli 7 years, 1 month ago

The energy possed by the body due to its motion is called kinetic energy

3Thank You

ANSWER

relasion b/w k.E. and force

Posted by Faiz Khan 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why we known as first law of motion is law of inertia

Posted by Vinod Gupta 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Newton’s first law of motion states that a body at rest will remain at rest, and a body in motion will continue in motion in a straight line with a uniform speed, unless it is compelled by an external force to change its state of rest or of uniform motion.

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convert in celcius 1- 200k 2 - 167k 3 - 257k

Posted by Faiz Khan 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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What are the constituents of red and black soils

Posted by Fiza Hussain 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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What is the difference between human and plants?

Posted by Saksham Agrawal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Prateek Mishra 7 years, 1 month ago

If the answer is on the basis of cell then the answer is = Animal cell 1. Usually smaller in size. 2. Oval in shape 3. Cytoplasm fills the entire cell and is dense 4. Nucleus is present in centre Plant cell 1. Comparatively larger in size. 2. Usually rectangular in shape 3. Cytoplasm forms a thin lining , as it is pushed by the periphery by vacuole. 4. Nucleus is present towards periphery

ANSWER

What are milch?

Posted by Sushil Kumar Pandhare 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 1 month ago

Milk giving animals

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What is pplo,s cell

Posted by Manoj Gupta 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 1 month ago

Polo stands for pluero pnemonia like organism which the the smallest cell known till now..it is also known as mycoplasma

3Thank You

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How does immune system of our body function

Posted by Jaiprakash Choudhary 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Rushali Popli 7 years, 1 month ago

An active immune system recruits many cells to the affected tissue to kill off the disease causing microbes. This recruitment process is called inflammation

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Why do we keep both snake and turtle in the same class?

Posted by Denil Patel 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Shreyas Joshi 7 years, 1 month ago

We consider both snake and turtle under same class (reptilia) because of; 1) Oviparous animals (eliminates Mamalia) 2) Exoskeleton of scales (eliminates Aves and Ambhibia) 3) 3½ chambered heart (eliminates Pisces)

ANSWER

Who is science

Posted by Md Hussain 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Crazy Boy 7 years, 1 month ago

It is very important subject

Md Hussain 7 years, 1 month ago

What is science

ANSWER

Define manure and fertilizer

Posted by Editor Aryan 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Manures: Manures are natural fertilizers. They are bulky sources of organic matter which supply nutrients in small quantities but organic matter in large quantities. Manures are prepared by the decomposition of animal excreta and plant waste. Manures include farmyard manure (FYM), compost, green manure etc.

Fertilizers: Fertilizers are commonly produced plant nutrients. Fertilizers supply nitrogen, phosphorous and potassium. They are used to ensure good vegetative growth, giving rise to healthy plants.

Take Me 7 years, 1 month ago

Manure- manure contains large quantities of organic matter and also supplies small quantities of nutrients to the soil. Fertilizer - fertilizers are commercially producd plant nutrients.