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2 years ago

Why are summer days longer than winter days on Earth?

Chemistry

2 answers:

zimovet [89]2 years ago

8 0

Answer:

A. During the summer, Earth's rotational axis is parallel to the Sun's rotational axis.

Explanation:

Actually, though, the Earth is tilted 23.4 degrees! (A circle is 360 degrees.) This tilt is the reason that days are longer in the summer and shorter in the winter. The hemisphere that's tilted closest to the Sun has the longest, brightest days because it gets more direct light from the Sun's rays.

Plz mark me brainliest if correct :)

tatyana61 [14]2 years ago

8 0

Answer:

Explanation:

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3 years ago

9. Thallium-208 has a half-life of 3.053 min. How long will it take for 120 g of it to decay

damaskus [11]

Answer:

12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.

Explanation:

Radioactive isotopes decay exponentially in time, the mass of the isotope ( $m(t)$ ), in grams, is described by the formula in time ( $t$ ), in minutes:

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

Where:

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

$\tau$ - Time constant, in minutes.

In addition, the time constant associated with the isotope decay can be described in terms of half-life ( $t_{1/2}$ ), in minutes:

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

If we know that $m(t) = 7.5\,g$ , $m_{o} = 120\,g$ and $t_{1/2} = 3.053\,min$ , then the time taken by the isotope is:

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

$\tau = \frac{3.053\,min}{\ln 2}$

$\tau \approx 4.405\,min$

$t = -\tau \cdot \ln \frac{m(t)}{m_{o}}$

$t = -(4.405\,min)\cdot \ln \left(\frac{7.5\,g}{120\,g} \right)$

$t \approx 12.213\,min$

12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.

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2 years ago

A chemical reaction produces formaldehyde, with a chemical formula of CH2O. Carbon is in Group 4A, oxygen is in Group 6A, and hy

ruslelena [56]

Answer:

A chemical reaction produces formaldehyde, with a chemical formula of CH2O. Carbon is in Group 4A, oxygen is in Group 6A, and hydrogen is in Group 1A on the periodic table. In one to two sentences, can you describe the bonds in a molecule of formaldehyde in terms of valence electrons?

Explanation:

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2 years ago