Answer:
Explanation:
Energy and mass are related by the famous equation developed by Albert Einstein:
where m = mass and c = speed of light
This equation explains that an object with very small mass can produce a large amount of energy in reactions such as a nuclear reaction.
Hence, the energy produced by the explosion of a Plutonium bomb containing 3.6 grams of matter is:
E =
The work done by the Coulomb force will be "".
Let us define the required work done to move that alpha particle to the one of the mid point of the side length as follows.
→
→
→
→
→
Thus the above answer is appropriate.
Learn more about work done here:
Answer:
1) n = 4.47*10^12 photons
2) K = 0.25 eV
Explanation:
This is a problem about the photoelectric effect.
1) In order to calculate the number of photons that impact the metal, you take into account the power of the light, which is given by:
(1)
Furthermore you calculate the energy of a photon with a wavelength of 600nm, by using the following formula:
(2)
c: speed of light = 3*10^8 m/s
h: Planck's constant = 6.626*10^-34 Js
λ: wavelength = 600*10^-9 m
You replace the values of the parameters in the equation (2):
Next, you calculate the quotient between the power of the light (equation (1)) and the energy of the photon:
The number of photons is 4.47*10^12
2) The kinetic energy of the electrons emitted by the metal is given by the following formula:
(3)
Ep: energy of the photons
Φ: work function of the metal = 1.7 eV
You first convert the energy of the photons to eV:
You replace in the equation (3):
The kinetic energy of the electrons emitted by the metal is 0.25 eV