Answer:
14.99 hours
Step-by-step explanation:
The formula for half-life is given as,
R/R' = 2ᵃ/ᵇ...................... Equation 1
Where R= Original mass of sodium-24, R' = mass of Sodium-24 after disintegration, a = Total time taken for sodium-24 to disintegrate, b = half-life of sodiun-24.
Given: R = 1 kg, R' = 0.0156 kg, a = 90 hours
Substitute into equation 1 and solve for b
1/(0.0156) = 2⁹⁰/ᵇ
Taking the log of both side
log[1/(0.0156)] = log(2⁹⁰/ᵇ)
log[1/(0.0156)] = 90/b(log2)
90/b = log[1/(0.0156)]/log2
90/b = 6.0023
b = 90/6.0023
b = 14.99 hours
b = 14.99 hours.
Hence the half-life of Sodium-24 is 14.99 hours
Answer:
A. SAS B. SSS C. AAS D. ASA
Step-by-step explanation:
A: Line segments AE and EB are congruent and line segments CE and ED are also congruent. The Angles in between line segments AE and EB and line segments CE and ED are congruent to each other
B: Line segments QT and TS are congruent. Line segments QR and RS are congruent. Both triangles share line segment TR
C: Angles A and B are congruent. Angles D1 and D2 are congruent. Line segment CD is shared between both triangles.
D: Angles C1 and C2 are congruent. Angles B1 and B2 are congruent. Line segment CB is shared between the two triangles.
What is the mode and median of 1,2,1,3,3,5,3,4,5,4,3,2,5,3,1.
tankabanditka [31]
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Answer:
b>1
Step-by-step explanation:
12-3b<9
-3b<9-12
-3b<-3
b>1