Remark
There are 2 kinds of Beta Decay. This one is an example of a neutron becomes a proton and the emitted particle is an electron.

Answer : T = 2 s and Speed = 6.28 m/s.
Explanation :
It is given that,
Mass of the ball, m = 10 kg
Radius of the circle, r = 2 m
The ball makes 30 revolutions per minute. So, frequency is given by :


We know that time period is defined as the reciprocal of frequency i.e.


So, the time period for the ball to go around once is 2 s.
Now, speed is defined as distance travelled per unit time. Distance travelled by ball in circular path is equal to the circumference of the circle.




Speed of the ball is 6.28 m/s.
Answer:
<h3>The answer is 2.04 g</h3>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
<h3>mass = Density × volume</h3>
From the question
density = 0.17 g/cm³
1 mL = 1 cm³
12 mL = 12 cm³
So we have
mass = 0.17 × 12
We have the final answer as
<h3>2.04 g</h3>
Hope this helps you
Answer:
it travels at a different refractive index.
Explanation:
for example when light travels into water, it slows down, causing it to continue to travel at a different or another angle or direction. hope this helped!
Answer:
(a), (c) and (e) s correct.
Explanation:
a. the power used by a circuit is the resistance times the current squared.
The power is given by P = I^2 R, so the statement is correct.
b. electric and magnetic fields are transporting the energy.
false
c. electrons are transporting the energy.
The energy is transferred by flow of electrons. It is correct.
d. the power used by a circuit is the voltage times the current squared.
The power is given by P = V I, the statement is wrong.
e. the power used by a circuit is the current times the voltage.
The power is given by P = V I, the statement is correct.