1. What is umbra ?
2. What is Shadow ?
3. What is an incandescent body ?give example.
4. How will you convert a glass sheet into a translucent
sheet?
5. What do you mean by scattering of light ?
6. Does adaptation takes place in a short time?
7. What is photosynthesis ?
8.What are the conditions necessary for the process of
photosynthesis ?
9. What is the site of photosynthesis?
10. What is the product of the process of photosynthesis ?
11.List the three conditions necessary for formation of
shadow.
12. Differentiate between luminous and non-luminous
object.
13. How a shadow differ from an object.
14. Differentiate between transparent, translucent and
opaque object.
Answers
Answer:
1. The fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse is called umbra.
2. 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.
3. The bodies which emit light when heated to a very high temperature are called incandescent. Example: Electric bulb.
4. There are a couple of ways to convert a glass sheet into a translucent sheet: (a) By applying a thin layer of oil on the glass sheet. (b) By placing a butter paper on the glass sheet.
5. Scattering occurs when light or other energy waves pass through an imperfect medium (such as air filled with particles of some sort) and are deflected from a straight path. ... The light is deflected off of its straight path and scatters in many directions.
6. Adaptation does not take place in a short time. It takes thousands of years for living beings to adapt to its habitat. Those animals which cannot adapt to these changes die out, and only the adapted ones survive.
7. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.
8. Sunlight, chlorophyll, carbon dioxide and water are the necessary conditions required for photosynthesis.
9. The Cell. All green parts of a plant, including green stems and unripened fruit, have chloroplasts, but the leaves are the major sites of photosynthesis in most plants. It is the light energy absorbed by chlorophyll that drives the synthesis of food molecules in the chloroplast.
10. In photosynthesis, energy from light is used to convert carbon dioxide and water into glucose and oxygen. For 6 carbon dioxide and 6 water molecules, 1 glucose molecule and 6 oxygen molecules are produced.
11. The following three things are required for a shadow to form: a source of light,An opaque object, a screen.
12. Objects that can emit light energy by themselves are known as luminous objects. Objects that cannot emit light energy by themselves are known as non-luminous objects. These objects can cause the sensation of light.
13. Light falls on all the objects but not all the objects forms shadow. If you take a ball, its shadow is formed. But if you take the same ball in the dark room, you cannot see the shadow of the ball.
14. Transparent objects allow all the light to pass through them, translucent ones allow partial light to pass, whereas opaque ones allow no light to pass through.
Answer:
Explanation:1:the darkest part of shadow.
2:our dark reflection of our mass by sun.
4:by removing the coated side one.and smoothing the side.
5:the beam of light rays being moving here and there.
7:the preparation of food in presence of sun light.or converting light energy to chemical energy.