Question

ans the following: ( consider the above one as que no. one)
2.) the pulse rate of a man is 80 beats in one min. Calculate its frequency.
3.) define the term valence shell.

plz ans all the ques correctly and ans it fast.
Note :- if u don't know then plz don't ans.

Answer 1

2.)1 min---->80 beats
i.e., 60 sec---->80 beats

therefore, 1s--->80 / 60
                         =1.3

therefore,frequency is 1.33Hz....

3)the outermost shell of an atom containing the valence electrons.




answer for the question which is given in the book..

a)earthworm=Annelid
b)planaria=Platyhelminthes
c)sycon=Sponge
d)starfish=Echinoderm
e)housefly=Arthropod
f)octopus=Molluscs

hope..u lyk my answer.

Answer 2

Earthworm -Annelid
Sycon- Sponge.
Housefly- Arthropods
Planaria -Platihelminthes
Starfish- Echinoderms
Octopus- Molluscs.
2.frequencey = 80/60
= 4/3
= 1.33 / second
= 1.33... Hertzs
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3.The outermost shell of any electron when electronic configuration is done.