Answer : The difference is that the selenium has more number of electrons as compared to aluminum.
Explanation :
The difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al are:
As we know that,
Element selenium has the atomic number 34 while the aluminium has atomic number of 13.
Element selenium belongs to the group 16 while aluminium belongs to group 3. The group determine the number of electron in its outermost shell.
This means that, selenium has six electrons in its outermost shell and aluminium has only three electrons in its outermost shell.
The electronic configuration of selenium is, while electronic configuration of aluminium is,
Thus, the difference between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminum is that the selenium has more number of electrons as compared to aluminum.
Answer:
Explanation:
Given
When we drop an object from height , suppose h
it takes time T
using equation of motion
where
here because it dropped from a certain height
When height is increases to three times of original height
i.e.
then time period becomes
Answer:
The magnification is
Explanation:
From the question we are told that
The power of the lens is
Generally
The object distance is the negative sign is because the distance is measured in the opposite direction of incident light (i.e away )
Generally the focal length is mathematically represented as
=>
=>
converting to cm
=>
Generally from lens equation we have that
=>
=>
Generally the magnification is mathematically represented as
=>
=>
