Electrons are ejected when sodium metal is irradiated with 400 nm light. what is the velocity of the electrons? (φna = 4.4 x 10-19 j)

The velocity of the sodium electrons is  m/s

Given the following data:

To find the velocity of the sodium electrons, we would use the equation of photoelectric effect:

Mathematically, the photoelectric effect is given  by the formula:

Where:

First of all, we would determine the photon frequency of the light.

Photon frequency =  Hertz

Now, we can determine the kinetic energy from eqn 1:

K.E = Joules.

Also, the kinetic energy possessed by an electron is given by the formula:

Velocity = m/s

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a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.