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Oduvanchick [21]
2 years ago
8

Parallel light rays are refracted _______and_____ to a point called as focal point after passing through convex lens.

Physics
1 answer:
tatuchka [14]2 years ago
4 0
Left and right to a point called ad focal point after passing through convex lens
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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms.
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Answer:

Explanation:

Initially no of atoms of A = N₀(A)

Initially no of atoms of B = N₀(B)

5 X N₀(A)  = N₀(B)

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For B

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N(A)₀ e^{-\lambda_1 t} = 5 x N₀(A)  e^{-\lambda_2 t}

e^{-\lambda_1 t} = 5  e^{-\lambda_2 t}

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

half life = .693 / λ

For A

.77 =  .693 / λ₁

λ₁ = .9 h⁻¹

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

Putting t = 2 h , λ₁ = .9 h⁻¹

e^{\lambda_2\times  2} = 5  e^{.9\times  2}

e^{\lambda_2\times  2} = 30.25

2 x λ₂ = 3.41

λ₂ = 1.7047

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= .4065 hours .

= .41 hours .

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Answer:  

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Explanation:

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