Sure, let's break this down step by step. The key concept here is the photoelectric effect, which is when light (or radiation) of a certain wavelength falls on a metal surface and causes the emission of electrons.
When light of sufficient energy (or wavelength) hits a metal surface, it can knock electrons loose, creating a flow of current. The minimum energy required to release an electron is called the threshold energy, which corresponds to a threshold wavelength.
In this case, the threshold wavelength of the metal surface is 620 nm. The stopping potential of the emitted electrons is 4.9 V. To find the wavelength of the incident radiation, we can use the formula:
Energy of incident radiation = Work Function + Kinetic Energy
Energy = hc/λ = eV0 + eVstop
Where:
Plugging in the values, we get:
hc/λ = eV0 + eVstop
(6.626 x 10-34 J·s)(3.00 x 108 m/s) / λ = (1.6 x 10-19 C)(4.9 V) + (1.6 x 10-19 C)(4.9 V)
Solving for λ, we find:
λ = (6.626 x 10-34 J·s)(3.00 x 108 m/s) / [(1.6 x 10-19 C)(4.9 V) + (1.6 x 10-19 C)(4.9 V)]
After calculating this, you will get the value of λ in nanometers. This is how you can determine the wavelength of the incident radiation based on the given threshold wavelength and stopping potential.
Three identical balls are placed on a frictionless
horizontal surface touching each other. They stick to
each other because of adhesive. Another ball of same
radius and mass m is placed over the void created by
the three balls. Find the forces applied by the balls
kept on the floor to each other if the system remains
in equilibrium.
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A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.
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