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Advocard [28]
2 years ago
14

PLEASE HELP ME WITH THIS ONE QUESTION

Physics
1 answer:
Marizza181 [45]2 years ago
7 0

Answer:

c) 2.02 x 10^16 nuclei

Explanation:

The isotope decay of an atom follows the equation:

ln[A] = -kt + ln[A]₀

<em>Where [A] is the amount of the isotope after time t, k is decay constant, [A]₀ is the initial amount of the isotope</em>

[A] = Our incognite

k is constant decay:

k = ln 2 / Half-life

k = ln 2 / 4.96 x 10^3 s

k = 1.40x10⁻⁴s⁻¹

t is time = 1.98 x 10^4 s

[A]₀ = 3.21 x 10^17 nuclei

ln[A] = -1.40x10⁻⁴s⁻¹*1.98 x 10^4 s + ln[3.21 x 10^17 nuclei]

ln[A] = 37.538

[A] = 2.01x10¹⁶ nuclei remain ≈

<h3>c) 2.02 x 10^16 nuclei</h3>
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a baseball flying through the air at 90 miles per hour

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Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.320 mm wide. The diffraction pattern is observed
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Answer:

W = 10.28\ mm

Explanation:

Given,

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a sin \theta_1 = m\lambda

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8 0
3 years ago
What type of wave does NOT need matter to carry energy? *
Blababa [14]

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An initially uncharged 3.67 μF capacitor and a 8.01 k Ω resistor are connected in series to a 1.50 V battery that has negligible
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The initial current in the circuit is 0.1873 mA

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resistance is given as 8010 Ω

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Since the capacitor is initially uncharged, the capacitive reactance is zero.

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What is the answer? please
Nitella [24]
I think it`s D but iam not so sure 
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