Answer:
The initial energy level = 6
Explanation:
Photon wavelength is proportional to energy. The wavelength of emitted photons is related to the energy levels of the atom as given by the Rydberg formula:
ₕ₁₂
(1/λ) = Rₕ [(1/n₂²) − (1/n₁²)]
where n₂ = final energy level = 2
n₁ = initial energy level = ?
Rₕ = Rydberg's constant = 1.097 × 10⁷ m⁻¹
λ = wavelength = 410 nm = 410 × 10⁻⁹ m
1/(410 × 10⁻⁹) = (1.097 × 10⁷) [(1/2²) − (1/n₁²)]
0.223 = [(1/4) − (1/n₁²)]
(1/n₁²) = 0.02778
n₁² = 1/0.02778 = 36
n₁ = 6.
Answer:
D) It does not change
Explanation:
Since there is no friction in the inclined plane. Therefore, there is no loss in the total mechanical energy of the system. So according to the law of conservation of energy we can write:
Total Mechanical Energy at Start = Total Mechanical Energy at End + Frictional Loss
Total Mechanical Energy at Start = Total Mechanical Energy at End + 0
Total Mechanical Energy at Start = Total Mechanical Energy at End
It means there is no change in the total mechanical energy of the system.
Therefore, the correct option is:
<u>D) It does not change</u>
Answer:
raise it as high as he can
Explanation:
Answer:
Option C is the answer = 28.0m/s
Option B
Explanation:
Applying the principle of conservation of energy which takes into consideration the total energy of the system , i.e the summation of the kinetic energy, potential energy. the conservation of energy deals with total energy of a system that changes by the transferring of energy to the system or from the system.
from the question,
height of water h = 40m
g = acceleration due to gravity = 9.81m/seconds square
from the addition of the kinetic energy(energy due to motion) and potential energy(energy by virtue of the position of an object) = initial (Kinetic + potential) = final ( kinetic + potential)
(mgh + 1/2mv -square)initial =( mgh + 1/2 mv -square) final
neglecting or eliminating the mass for both the initial and final,
V-square = 2gh = 2 x 9.81 x 40 = 784.8 = 28.01m/s