Question

can anyone tell me the important points of chapter 11 science? class 6

Answer 1

Answer:

I had the lesson:- light, shadow and reflection in class 6.. I think same for you..

Explanation:

Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometers, or 4.00 × 10⁻⁷ to 7.00 × 10⁻⁷ m, between the infrared and the ultraviolet.

A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.

Answer 2

chapter 6

change around us...

*some change are beneficial to us where as some are harmful to us . The ripening of fruits is a beneficial change. The spoiling of cooked food is a harmful change.

* some of the change can be reversed whereas other changes cannot be reversed.

*All the changes around us can be classified into two groups 1. Reversible change

2. Irreversible change

*Reversible change ------

A change which can be reversed to form the

" original substance" is called reversible change.

for example- rolling a Chapatti from dough

* Irreversible change----

A change which cannot be reversed to form the original substance is called irreversible change.

for example- baking of Chapatti...

hope this chapter is your chapter-6

hope it Will help you