How the seeds got to a place away from the tree

1 answer:

6 0

There are quite a few ways that seeds can be dispersed. A few examples could be by wind (like dandelions), water (like water lilies or coconuts), or animals (through friut eaten by birds or other animals).

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If a crystal of potassium permanganate is placed on agar and after 15 minutes the diameter of the area over which the dye has sp

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Answer:

Diffusion rate is 1.96 × $10^{-3}$ $cm^{2}$ /s

Explanation:

Diffusion is the process in which the molecules of a substance propagates from a region of higher concentration to region of lower concentration through a semi-permeable membrane.

diffusion rate = $\frac{area}{time}$

Given that; diameter = 15 mm, time = 15 minutes.

The dye spread in a circular form, so that;

area = $\pi$ $r^{2}$

r = $\frac{diameter}{2}$ = $\frac{15}{2}$ = 7.5 mm = 0.75 cm

area = $\frac{22}{7}$ × $(0.75)^{2}$ = 1.7679 $cm^{2}$

time = 15 minutes = 15 × 60 = 900 seconds

So that;

diffusion rate = $\frac{1.7679}{900}$

= 0.0019643 $cm^{2}$ /s

Diffusion rate is 1.96 × $10^{-3}$ $cm^{2}$ /s

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A bell is rungs by striking it once. The vibration builds up in intensity becoming loud enough to hear. The concepts is known a

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The answer is A. resonance. A resonant frequency means a natural frequency which is a part of vibration made by the physical parameters of any vibrating object. A vibrating object will get the resonant frequency from complex excitation and would vibrate.

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