Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 4 to the n = 2 principal energy level. Your answer should have 4 sig figs

In Einstein's photoelectric experiment, the kinetic energy of an electron displaced from a metal by a photon was the difference between the energy of a photon and a threshold energy value for the metal. If you were to perform a similar experiment with cobalt, which has a threshold energy of 8.01 × 10⁻¹⁹ J, and ultraviolet light of wavelength 29.5 nm, what would be the kinetic energy (in J) of the electron displaced?

A laser pointer used in the classroom emits light at 4950 Å, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

For photons with the following energies, calculate the wavelength and identify the region of the spectrum they are from: (a) 3.5 x 10−20 J, (b) 8.7 x 10−26 J, (c) 7.1 x 10−17 J, (d) 5.5 x 10−27 J

2. A laser pointer used in the classroom emits light at 6550 A, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

Determine the wavelength of light (in nm) emitted when an electron in the hydrogen atom transitions from 5 to nf = 1. [Give your answer as a whole number]

The electron in an (unbound) hydrogen atom (H(g)) is excited from the ground state to the n=3 state.Which of the following statements are true and which are false. 1. it takes less energy to ionize the electron from n=3 than it does from the ground state.2. The wavelength of the light emitted when the electron returns to the ground state from n=3 is the same as the wavelength of light absorbed to go from n=1 to n=3.3. the electron is farther from the nucleus on average in the n=3 state than in the ground state.4. The first excited state corresponds to n=3.5. The wavelength of light emitted when the electron drops from n=3 to n=2 is shorter than the wavelength of light emitted if the electron falls from n=3 to n=1.

Data for the photoelectric effect of silver are given in the table. Frequency of incident radiation (1015 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 Using these data, find the experimentally determined value of Planck's constant, h , and the threshold frequency, ν0 , for silver.

Enter your answer in the provided box. Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n= 6 to n=4 state.

In Einstein's photoelectric experiment, the kinetic energy (K.E.) of an electron displaced from a metal by a photon was the difference in energy between the photon and a threshold energy value for the metal. If you were to perform a similar experiment with the metal silver, which has a threshold energy of 7.43 × 10⁻¹⁹ J, and ultraviolet light of wavelength 45.5 nm, what would be the speed (v) of the dislodged electron in meters per second? (K.E. = 1/2mv². The mass of the electron = 9.109 × 10⁻³¹ kg.)