Question

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Answer 1

                                           I. Activity

1. Sonority is the characteristic of a metal to emit a deep resonant sound when struck. Metals are sonorous and some are used for making bells. Non-metals are not sonorous and do not emit a sound when struck with an object. Sonority is the property of a metal which produces ringing sound when struck by a hard object.

                                     II Assessment

2. Luster is the property of minerals that shows how much or how well the mineral reflects light. Luster may also be spelled lustre.

3. Wooden bells is not used in schools and temples because when wooden material collide with wooden material , it will not produced any sound. But if we ring a metal bell , the sound will come from it because metals are sonorous. The ring of the bell is very pleasant to to our ears.

                                       III. Fill in the blanks:

 1. Mercury is a Liquid Metal.

2. Yes, a mirror can be called metal.

3. The materials which produce ringing sounds are called sonorus material.

                         Hope it helps you

Answer 2

Answer:

I Activity:-

1. Sonority is the characteristic of a metal to emit a deep resonant sound when struck. Metals are sonorous and some are used for making bells. Non-metals are not sonorous and do not emit a sound when struck with an object.

II Assessment :

2. Lustre, in mineralogy, the appearance of a mineral surface in terms of its light-reflective qualities. ... Variations in these properties produce different kinds of lustre, whereas variations in the quantity of reflected light produce different intensities of the same lustre.

3. Wooden bells have never seen in temples. The reason is that when wooden material collide with wooden material , it will not produced any sound. ... But if we ring a metal bell , the sound will come from it because metals are sonorous. The ring of the bell is very pleasant to to our ears.

Bells are made up of metals Rather than wood because according to the physical properties of metals, they have highly sonorous....and if you would bang a piese of wood instead of wood , no voice will be produced and hence your bell will be of no use.....!!!!!!!!!!

That's why wooden bells are not used in schools and temples .

III Fill in the blanks:

1. Gallium is a liquid metal .

2. Yes , a mirror can be called a metal .

3. Material which produce ringing sounds are called sonorous materials .