Name the particles which determine the mass of an atom. ?

 

the electrons present in it has very less mass as compared to that of proton and hence it is not considered while calculation Atomic mass.

Mass of a Electron = (1/1849) times of proton 

So The mass is protons and neutrons present in a atom is only considered as the mass of an atom 

Atomic mass = mass of neutron+ mass of proton.

Brief about the chapter sound?

Sound is an energy

Sound propagate(means aage badna) in wave form 

Wave form means aapne kabhi patther fenka hai taalaab main

After throwing stones you can see circular wave 

When you want to walk you need a medium which is called land 

In such a way to propagate sound they need air , water and land which is called medium

Islia moon per air no hone ki wajah se we are not be able to heard sound on moon

Expain about different habitats from chapter 1 matters in our surroundings?

Habitat=place where we live 

Mostly two types

aquatic=aqua meansWATER=ocean,pond lake, rivers etc

Territorial= means Land=forests, desert mountain,bank of the river etc

Should I opt for ecommerce or science for my son. He is entering class 9th ?

Mam it's based on your child interest and his ability to catch up the subject .So both are great as ecommerce leads to banking or private sector and science as u already know leads to engineering,scientist,teachers etc..

Allen or Aakash for NEET which is better. ?

NO ONE IS BAD.ITS DEPENDS ON YOUR ABILITY TO COPE UP WIT NEW CONCEPTS THATS MATTER THE MOST AS BOTH OF ALLEN AND AAKASH ARE BEST AT THEIR OWN LEVELS.

Can someone suggest me a nice study strategy for class 9th. So that my concept are strong ?

To make your concepts stronger and life long you must have to relate yourself with the life examples.You have to relate yourself with the concept by taking practical examples.So this will make your concepts even deeper and stronger.

How do I score good marks in science class 9?

Science is a practical and theoretical knowledge.when you will be able to correlate all your books concept with your surroundings object then there will be not necessary to muggup all formula and concept.and will be strong in those sections automatically Your marks will be improve

Maths?

No Answer Given

Maths?

Yes we have periodic batches for maths subject .