An evacuated tube uses an accelerating voltage of 39 kV to accelerate electrons to hit a copper plate and produce x rays. What would be the final speed of such an electron? Hint: Go back to Unit 1! Conservation of energy applies. I have just now given you potential (V) instead of potential energy (U). m/s

7.17  × 10⁷ volts

Explanation:

It is given that,

Voltage to accelerate electrons to hit a copper plate and produce X-rays,

Using the conservation of energy for the electrons as :

m is the mass of electron

For the proton, mass,

Now using the conservation of energy for the protons. We get :

the answer is mosques. they are an important part of islamic culture.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.