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1 st b part ni hai baki sara hai ....hope it hlps....
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shikhar40:
Ok
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mere khne ka mtlb hai ki plz pic sahe se click karo sab dhundhala dikh raha hai par rukko jo smjh aa raha hai ans de ti hu oky.....
sorry I had not looked your ans
sorry
in which class do you read
sorry for what dear....
11 th....☺
good..
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Hey mate,
(a) An echo is the repetition of the original sound heard after the sound is reflected from a distant, dense and rigid object.
the speed of sound in air is 340m/s and the minimum time required for formation of echo is 0.1 second.
So, distance travelled in 0.1 sec. = 340×0.1 = 34m
As the echo is twice the minimum distance between a source of sound and the reflecting surface = 34÷2 = 17m
the minimum distance is 17m.
21.(b) It is easier to swim in sea water than in river water because the salt present in sea water makes it more denser than river water and our body floats more higher in sea water and Hence, it is more easier to swim in sea water.
22. It is used to stirr the mixture of ice and water. it is also used to check the distribution of heat that is supplied.
(a) An echo is the repetition of the original sound heard after the sound is reflected from a distant, dense and rigid object.
the speed of sound in air is 340m/s and the minimum time required for formation of echo is 0.1 second.
So, distance travelled in 0.1 sec. = 340×0.1 = 34m
As the echo is twice the minimum distance between a source of sound and the reflecting surface = 34÷2 = 17m
the minimum distance is 17m.
21.(b) It is easier to swim in sea water than in river water because the salt present in sea water makes it more denser than river water and our body floats more higher in sea water and Hence, it is more easier to swim in sea water.
22. It is used to stirr the mixture of ice and water. it is also used to check the distribution of heat that is supplied.
actually I can't read the question properly thats why I am telling
and by the way it is physics question
and not mathematics
but you should have to fine dine in all subjects
yaa I know
Thanks
in which class do you read
In class 8th
and you
in 7th but I do study of 9th. and teach also
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