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
lord [1]
3 years ago
7

How many half-lives have passed if a sample contains 25% of its original carbon-14?

Physics
1 answer:
ICE Princess25 [194]3 years ago
6 0

Answer: 2 half lives

You might be interested in
A person carries a box of 100 kg. What is the weight of the box? (g= 9.8 m/s2)​
aliina [53]

Answer:

980 newton

Explanation:

100×9.8 = 980

8 0
3 years ago
The resistivity of a metal increases slightly with increased temperature. This can be expressed as rho= rho0[1+α(T−T0)] , where
Stolb23 [73]

Answer:

At 81. 52 Deg C its resistance will be 0.31 Ω.

Explanation:

The resistance of wire =R_T =\frac{\rho_T \ l}{A}

Where R_T =Resistance of wire at Temperature T

\rho_T = Resistivity at temperature T =\rho_0 \ [1 \ + \alpha\ (T-T_0\ )]

Where T_0 =20\ Deg\ C , \  \rho_0 = Constant,  \alpha =3.9 \times 10^-^3 DegC^-1 \ (Given)

l=Length of the wire

& A = Area of cross section of wire

For long and thin wire the resistance & resistivity relation will be as follows

\frac{R_T_1}{R_T_2}=\frac{\rho_0(1+\alpha \cdot(T_1-2 0 )}{\rho_0(1+\alpha \cdot (T_2 -20 )}

\frac{0.25}{0.31}=\frac{1}{[1+\alpha(T-20)]}

1.24=1+\alpha (T-20)

0.24=\alpha(\ T -20 )

Putting\ the\ value\ of \alpha = 3.9 \times 10^-^3 DegC^-1

T = 81.52 Deg C

4 0
3 years ago
Which statement describes the endothermic reaction by this graph?
alexgriva [62]

Answer:

B

endothermic: heat taking in

exothermic: heat given out

8 0
3 years ago
Read 2 more answers
Is there a sound loud enough to kill a person ?
shepuryov [24]

In space there is. Items such as a supernova will instantly end your life.

6 0
3 years ago
Read 2 more answers
Integrated Science- 8th grade science
mart [117]

Answer:

"Why"

Explanation: A scientific law is a description of how the natural world behaves under certain circumstances.

7 0
3 years ago
Read 2 more answers
Other questions:
  • What is an object doing at the moment its instantaneous acceleration is zero?
    11·1 answer
  • You’ve made the finals of the science Olympics. As one of your tasks you’re given 1.0 g of copper and asked to make a cylindrica
    12·2 answers
  • What is the answer to this question
    14·1 answer
  • Which statements about the moon’s phases are true? Check all that apply.
    12·2 answers
  • A grain silo is shown below:grain silo formed by cylinder with radius 5 feet and height 175 feet and a half sphere on the topwha
    8·1 answer
  • !!!!!PLEASE ANSWER CORRECTLY!! I DESPERATLY NEED HELP!!!!!
    6·1 answer
  • Which of the following is a pure substance?
    10·2 answers
  • If the sun had twice the mace how would that affect the gravitational force of the sun
    6·1 answer
  • 3. A 1500 kg car moving at 30 m/s strikes a 6000 kg van initially at rest. If the car
    7·1 answer
  • How did planck find the correct curve for the specturm of light emitted by a hot obkect?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!