A student observes that in the photoelectric effect, photons need to have well-defined energies in order to move electrons. Which statement is correct about this explanation? (1 point) a. A wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.

b. Either a particle model or a wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.

c. Neither a particle model nor a wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.

d. A particle model of electromagnetic radiation can sufficiently explain the photoelectric effect.

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:

change tension

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle