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iogann1982 [59]

3 years ago

6

The yield of the land refers to which of the following?

1 answer:

daser333 [38]3 years ago

4 0

Answer:

please mark as brainliest answer as it will also give you 3 points

The correct answer is A

The amount of crop output from a given area of planted land

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How many countries are there in Asia?

k0ka [10]

There are about 48 countries in Asia.

<span>Asia is split within six areas. Central, Eastern, Northern, Southern, Western and Southeastern Asia. </span>

5 0

3 years ago

Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after

Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time ( $m (t)$ ), in grams, is described below:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ (1)

Where:

$m_{o}$ - Initial mass, in grams.

$t$ - Time, in years.

$\tau$ - Time constant, in years.

The time constant can be found from half life ( $t_{1/2}$ ), in years, described in statement:

$\tau = \frac{t_{1/2}}{\ln 2}$ (2)

If we know that $m_{o} = 300\,g$ , $t = 3.9\times 10^{9}\,yr$ and $t_{1/2} = 1.3\times 10^{9}\,yr$ , then the current amount of the sample is:

$\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}$

$\tau \approx 1.876\times 10^{9}\,yr$

$m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }$

$m\approx 37.521\,g$

The current amount of the Potassium-40 sample is approximately 37.521 grams.

4 0

2 years ago

Tell me two countries, from two different continents please!! :))))

s344n2d4d5 [400]

Russia and Egypt. :DDDD

7 0

3 years ago

In recent years, the largest numbers of Somali refugees fled to all of the following countries, except __________.

MAVERICK [17]

Is it United States XDDD

5 0

3 years ago

Read 2 more answers

Some seats in New Zealand’s legislature are reserved for __________. A. ethnic politicians B. female politicians C. Aboriginal p

sergij07 [2.7K]

Answer:

D. Maori politicians

Explanation:

indigenous representation

3 0

3 years ago