Answer:
Explanation:
Answer:
Explanation:
The half life is the time taken for half of a radioactive substance to disintegrate.
The shorter the half life, the larger the decay constant and the faster the decay process.
For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.
With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.
If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.
Answer:
1) b. more quickly than
Explanation:
It is stated in the question that Albert's watch is ticking more slowly than more quickly than at the same rate as her own watch.
Answer:
2) a. more slowly than
Explanation:
Albert's watch is ticking more slowly than more quickly than at the same rate as her own watch.
Answer:
0.103 m/s to the south
Explanation:
The total momentum of the launcher+ball system must be conserved before and after the launch, so we can write:
![p_i = p_f\\0 = m_L v_L + m_B v_B](https://tex.z-dn.net/?f=p_i%20%3D%20p_f%5C%5C0%20%3D%20m_L%20v_L%20%2B%20m_B%20v_B)
where
is the total initial momentum (before the launch)
is the mass of the launcher
is the velocity of the launcher after the launch
is the mass of the ball
is the velocity of the ball after the launch (we take the north direction as positive)
Solving for
, we find
![v_L = -\frac{m_B v_B}{m_L}=-\frac{(0.057 kg)(+36 m/s)}{20 kg}=-0.103 m/s](https://tex.z-dn.net/?f=v_L%20%3D%20-%5Cfrac%7Bm_B%20v_B%7D%7Bm_L%7D%3D-%5Cfrac%7B%280.057%20kg%29%28%2B36%20m%2Fs%29%7D%7B20%20kg%7D%3D-0.103%20m%2Fs)
and the negative sign means that the direction is south.