A hydrogen atom is in an excited state when its electron is in the n = 4 energy level. According to the Bohr model, how many spectral lines are possible when the electron returns to the ground state? (In a large sample of atoms, all possibilities will occur.)   a 3 b 4 c 5 d 6

please help as soon as possible

Determine the wavelength if the electron is excited n=2 for Helium (Z=2).( E=(-13.6ev)Z2/n2 and 1/mu=1/hc(En-En-1)

What wavelength of light is emitted by a hydrogen atom in which an electron makes a transition from the n = 5 to the n = 2 state? Enter this wavelength expressed in nanometers to one decimal place. 1 nm = 1 x 10-9 m  Assume the Bohr model.

An electron in a hydrogen atom is excited from the ground state to the n = 3 state. True or false?a) The wavelength of light emitted when the electron drops from n=3  to n = 1 is longer than that from n = 3 to n = 2.

Consider the atom having the electron configuration 1s2 2s2 2p6 3s2 3p1. Which of the following statements are correct? Tick all that apply, say the correct options. The atom has no electrons in tje energy level n=3 ?the atom has only electron in the state n=3 I=2 ?the atom has six electrons in the state n=2 I=1 ?The atom has three electrons in the energy level for which n=3 ?The atom has electrons in states n=2 and n=3 ?

What wavelength of light is emitted by a hydrogen atom in which an electron makes a transition from the n = 8 to the n = 5 state? Enter this wavelength expressed in nanometers. 1 nm = 1 x 10-9 m  Assume the Bohr model.

A photon is emitted when a hydrogen atom undergoes a transition from the n = 6 state to the n = 2 state. Calculate values for the following. (a) the wavelength nm (b) the frequency Hz (c) the energy of the emitted photon eV