Answer:
1.8 cm
Explanation:
= mass of the singly charged positive ion = 3.46 x 10⁻²⁶ kg
= charge on the singly charged positive ion = 1.6 x 10⁻¹⁹ C
=Potential difference through which the ion is accelerated = 215 V
= Speed of the ion
Using conservation of energy
Kinetic energy gained by ion = Electric potential energy lost

= Radius of the path followed by ion
= Magnitude of magnetic field = 0.522 T
the magnetic force on the ion provides the necessary centripetal force, hence

C. A combined circuit
That’s the answer
When the elastic potential energy in the ruler was released it gave energy to the coin thus launching into the air. The coin got its kinetic energy from the ruler
You do not hear it as clearly as you did, the frequency goes down. Likewise, if you moved closer you would hear it more.
Here we can use standard formula for motion with an acceleration: V = gt.
All we need is to find the time of falling t. We know that H = (gt^2)/2.
So, t = sqrt(2H/g) = sqrt(2*1.6/9.8) = 0,571 s.
At last, V = gt = 9.8*0.571 = 5,596 m/s.