Question

what is the value of radius for the first time
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Answer 1

Explanation:

$\huge \red{Question: - }$

What are periodic changes? Are most of the changes that we see around in daily life periodic?

$\huge\red {Answer:-}$

1. Plant cells have different shapes. - $\red{\sf{False}}$

$\implies$ αmímαl cells have diffeeent shapes.

2. The cell membrane is freely permeable - $\red{\sf{False}}$

3. The longest coll is that of an ostrich egg- $\red{\sf{False}}$

4. The colours imparted by chromoplasts promote pollination - $\red{\sf{False}}$

5. Centrosomes help in cell division- $\red{\sf{False}}$

Answer 2

Answer:

$\huge \underline \mathbb {answer:-}$

ANSWER

The radius of n+n Bohr orbit is given by,

rn=4π2mZe2n2n2

Now, for hydrogen, Ze=1 and

for first orbit, n=1

∴r1=4π2me2n2=0.529°

Thus, Bohr radius is the mean radius of the orbit of an electron around the nucleus of a hydrogen atom at its ground state.