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4 years ago

Which statement about astrology is not true?

Physics

2 answers:

Brrunno [24]4 years ago

5 0

A. planets do not affect birth defects

sweet-ann [11.9K]4 years ago

5 0

Answer:

C. Astrology made contributions to the science of astronomy.

Explanation:

Astrology is predicting the future or personality of someone basis their zodiac signs and the positions of celestial objects at the time of their birth. It is not based on latest facts of astronomy and doesn't take the change in the state of celestial objects in their prediction.

That is why it is called a pseudoscience. It has not contributed in the science of Astronomy. In fact the astrologers used the findings of astronomy to crate this pseudoscience. That is why statement 3 is not true about astrology.

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3 years ago

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Natalka [10]

Answer:

Explanation:

The half-life is the time it takes for the amount of radioactive isotope to halve. Therefore, we have:

- After 1 half-life, only 1/2 of the element will be left

- After 2 half-lives, only 1/4 of the element will be left

- After 3 half-lives, only 1/8 of the element will be left

So, it will take 3 half-lives for the element to become 1/8 of its original amount.

Mathematically, this can be also verified by using the equation

$\frac{N(t)}{N_0}=(\frac{1}{2})^\frac{t}{\tau_{1/2}}$

where

N(t) is the amount of the element left at time t

N0 is the initial amount of the element

$\tau_{1/2}$ is the half-life

Substituting $t=3\tau_{1/2}$ (3 half-lives), we find

$\frac{N(t)}{N_0}=(\frac{1}{2})^3=\frac{1}{8}$

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3 years ago

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Answer:

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Explanation:

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3 years ago

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Explanation:

The explanation is in the attachment.

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