Calculate the energy of a photon emitted when an electron in a hydrogen atom und

Question

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 4 to n = 1.

Data for the photoelectric effect of silver are given in the following table.

Using these data, find the experimentally determined value of Planck's constant, h, and the threshold frequency, 0, for silver.

Microwave ovens emit microwave energy with a wavelength of 13.0 cm. What is the energy of exactly one photon of this microwave radiation?

A certain rifle bullet has a mass of 7.65 g. Calculate the de Broglie wavelength of the bullet traveling at 1793 miles per hour.

A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.047 nm. What is the final state of the hydrogen atom?

Frequency of incident radiation (10^15 s^-1) Kinetic energy of ejected electrons (10^-19 J) 2.00 5.90 2.50 9.21 3.00 12.52 3.50 15.84 4.00 19.15

Explanation / Answer

According to Bohr's theory for Hydrogen atom,

Energy of a photon emitted when an electron jumps from an orbit n1 to another orbit n2 is given by

E = 2.18 x 10^-18 [(1/n1^2) - (1/n2^2)]

E = 2.18 x 10^-18 [(1/4^2) - (1/1^2)]

E = 2.18 x 10^-18 [(1/16) - 1]

E = 2.18 x 10^-18 (-0.9375)

E = -2.0437 x 10-18 J

second problem i am bot sure

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