1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lady_Fox [76]
2 years ago
5

A sample contains 36 g of a radioactive isotope. How much radioactive isotope remains in the sample after 3 half-lives?

Physics
2 answers:
LiRa [457]2 years ago
5 0
Answer:
4.5g

Explanation:

No = 36g Let half life is T

T= 3 T n number of half lives = t/T=3

N/No= (1/2)^n

Where, No be the initial amount

N be the amount left

n be the number of half lives

N/36 = (1/2)^3

N/36 = 1/8

N = 36/8 = 4.5g
Gre4nikov [31]2 years ago
3 0

Answer:

<u>Option "C":</u> "4.5 g"

Explanation:

N0 = 36 g, Let half-life is T.

t = 3 T, n is number of half lives = t / T = 3

<u>By using the decay law of radioactivity</u>

N / N0 = (1 / 2)^n

where

"N0" be the "initial amount"

"N" be the "amount left"

"n" be the "number of half-lives"

N / 36 = (1/2)^3

N / 36 = 1 / 8

N = 36 / 8 = 4.5 g

You might be interested in
Which subatomic particle has the least mass?
goblinko [34]

Answer:

electron

Explanation:

6 0
3 years ago
IF YOUR GOOD AT SCIENCE THEN PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST
Digiron [165]

Answer:

This is an open circuit

Explanation:

An open circuit I believe

It needs to be closed for the bulb to be turned on

8 0
2 years ago
Density=2g/mL and volume=20mL what is mass
leva [86]

Answer:

40g

Explanation:

Mass = density x volume

= 2 x 20

= 40g

8 0
3 years ago
Read 2 more answers
After exercise your heart rate is
harina [27]

Your heart rate is higher than normal.

7 0
3 years ago
Read 2 more answers
"W trudnych sytuacjach człowiek znajduje w sobie siłę i odwagę by walczyc " napisze rozprawke w której rozważe w jaki sposób syt
Oksi-84 [34.3K]

Answer:

Is this even english?

Explanation:

Its unreadable.

8 0
2 years ago
Other questions:
  • A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the pl
    13·1 answer
  • 11.76 cm² into two significant figures and include the appropriate units
    14·1 answer
  • How can an object overcome static friction?
    14·1 answer
  • What is the acceleration of this object? The object's mass is 60 kg.
    15·2 answers
  • Waves with a higher frequency have a ______ wavelength and _____ energy. *
    7·1 answer
  • Helpppppp please anybody who knows
    6·1 answer
  • Explain the process of photosynthesis, se sure to include the reactants and products.
    14·1 answer
  • Do this for alot of points
    15·1 answer
  • Please answer this question ​
    6·1 answer
  • What fraction of the water must evaporate to remove precisely enough energy to keep the temperature constant? water at 37°c has
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!