At what speed must an electron travel to have a wavelength of 13.6 pm ?

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 2.92×10^14 s^−1. ?0= With what maximum kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of 235 nm?   ??electron=

Light of frequency 1.6 × 1015 Hz illuminates a piece of iron, and the iron emits photoelectrons with a maximum kinetic energy of 2.7 eV. What is the threshold frequency of the metal? Planck’s constant is 6.63 × 10−34 J · s. Answer in units of Hz.

A hydrogen atom is in its second excited state, corresponding to n = 3. Find (a) the radius of the electron’s Bohr orbit and (b) the de Broglie wavelength of the electron in this orbit.

So Determine the distance between the electron and proton in an atom if the potential energy ?U of the electron is 15.4 eV (electronvolt, 1 eV =1.6×10−19=1.6×10−19 J). Give your answer in Angstrom (1 A = 10-10 m)

An unknown metal sample is interrogated using a beam of X-rays to liberate electrons which are then caught by a detector that determines their kinetic energy. A beam of X-rays with wavelength 9.54nm irradiate the surface of this metal, and the detector observes electrons with kinetic energies equal to 7.3716*10-18 J. What is the binding energy of this unknown metal sample.

A free electron in a gas is struck by a 5.95 nm X-ray, which experiences an increase in wavelength of 1.97 pm. How fast is the electron moving after the interaction with the X-ray? (in m/s) A: 1.079x105 OB: 1.220x10 Oc: 1.378x10 OD: 1.558x105 OE: 1.760x105 OF: 1.989x10 OG: 2.247x10 OH: 2.540x105 Submit Answer Tries 0/20

An electron has a kinetic energy of 4.1 × 10–¹³ J. 46. What is the electron's speed? (a) 0.960c (b) 0.968c (c) 0.972c (d) 0.980c (e) 0.986c 47. What is the de Broglie wavelength of the electron described? (a) 4.09 × 10-13 m (b) 4.94 × 10-13m (c) 5.42 × 10-13 m (d) 6.25 × 10-13 m (e) 7.81 x 10-13m

A certain microscopic object has a wavelength of 8.4 x 10*-14 m and a speed of 1.2 × 10*5 m/s. What is the mass of the object?

(a) If the wavelength of an electron is 5.20 ✕ 10−7 m, how fast is it moving? km/s(b) If the electron has a speed equal to 8.60 ✕ 106 m/s, what is its wavelength? m