An exploding fire cracker lights as well as makes a sound.

An exploding firecracker lights up as well as makes a sound.

Answer the following Give some examples of good as well as bad reflectors of sound.

Identify and write the soncept upon which a given statement is based upon . (e) Rocket ,a type of fire cracker used in diwli is a type of launcher . Name the law that explains its working.

A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is

Explain the adaptation in fish body which makes floating on water as well as going in deep water easy.

Choose the correct alternative. When fire crackers are exploded, the energy which gets converted into sound, light and heat is