It takes 254 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of kuhn (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect ? (h=6.626x10^-34Js)

Consider an electron in the hydrogen atom that transitions from the n=4 energy level to the n=2 energy level, 1. Calculate the wavelength (in nm) associated with the electron 2. Calculate the frequency (in s-1) associated with the electron 3. Calculate the amount of energy (in joules) of 1 electron that is emitted 4. Calculate the amount of energy (in kilojoules) of 1 mole of electrons that is emitted

The electron microscope uses the wave property of electrons to observe very small objects. A moving electron has a wavelength described by the de Broglie equation. What would be the wavelength, in m, of an electron with a kinetic energy of 3.55 × 10⁻¹⁹ J, which would be equivalent to the energy of a photon in the visible region? (The mass of an electron is 9.11 × 10⁻²⁸ g.)

Calculate the wavelength (in nm) detected when an electron drops from ni = 5 to nf =2 Where on the electromagnetic spectrum will you find the wavelength? What is the energy associated with the wavelength?

An atom requires 6.24 × 10^-19J to remove its furthest electron in the gas phase. What is the maximum wavelength of electromagnetic radiation that will result in ionization? Report your numerical answer in units of nm. Use significant figures. h = 6.626 x 10^-34 m^2 kg/s  ; c = 2.998 x 10^8 m/s.

An energy of 353 kJ/mol is required to cause a magnesium atom on the metal's surface to lose an electron. Calculate the lowest frequency of light that can ionize a magnesium atom.

The threshold frequency vo describes the smallest light frequency capable of ejecting electrons from a metal. Determine the minimum energy Eo of a photon capable of ejecting electrons from a metal with vo = 2.66 x 10¹4 s-¹. Eo = What is the maximum kinetic energy KEclection of electrons ejected from this metal by light with a wavelength of 255 nm? KEclectron =

The photoelectric effect can be used in engineering designs for practical applications. For example, infrared goggles used in night-vision applications have materials that give an electrical signal with exposure to the relatively long wavelength of IR light. If the energy needed for signal generation is 7.6 x 10-40 J, what is the minimum wavelength? What is the frequency of light that can be detected? c = 2.998 × 10° m/s h = 6.626 x 10-34 J s m S -1

The work function (φ) for a metal is the amount of energy needed to eject an electron from the surface of the metal via the photoelectric effect. For nickel φ = 8.25 x 10-19J. Will a photon with a wavelength (λ) of 250.0 nm have enough energy to eject an electron from nickel?  If the speed of an electron in the n = 4 energy level of a hydrogen electron is 2.3 x 106 m/s, what is the de Broglie wavelength of this electron in nanometers (the mass of an electron is 9.10938 x 10-31 kg). Note: 1 ? = 1 ?? ∙?2 An F-15 Strike Eagle weighs in at roughly 32,000 kg fully loaded. If an F-15 Eagle is traveling at 3,017 kilometers per hour, what is the de Broglie wavelength associated with the aircraft at this speed in nanometers?

The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ?0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 3.20×1014 s−1. With what maximum kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of 285 nm?