de Broglie explained the Bohr's postulate of quantization by particle nature of electron(True/False)

The de-Broglie equation treats an electron to be

which of the following postulates of the Bohr model led to the quantization of energy of the hydrogen atom ?

(a) Using Bohr's second postulate of quantization of orbital angular momentum show that the circumference of the electron in the n^(th) orbital state in hydrogen atom is n times the de-Broglie wavelength associated with it. (b) The electron in hydrogen atom is initially in the third excited state. What is the maximum number of spectral lines which can be emitted which it finally moves to the ground state ?

The de Broglie wavelength associated with particle is

The key feature of Bohr's spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid.The rule to be applied is Bohr's quantization condition. A diatomic molecule has moment of inertia I . By Bohr's quantization condition its rotational energy in the n^(th) level ( n = 0 is not allowed ) is

The key feature of Bohr's spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid.The rule to be applied is Bohr's quantization condition. A diatomic molecule has moment of inertia I . By Bohr's quantization condition its rotational energy in the n^(th) level ( n = 0 is not allowed ) is

The de Broglie waves are associated with moving particles. These particle may be

The de-Broglie wavelength of electron in gound state of an hydrogen atom is

The radius of and alpha -particle moving in a circle in a constant magnetic field is half of the radius of and electron moving in circular path in the same field. The de Broglie wavelength of alpha -particle is n times that of the electron. Find n (an integer).

If the de Broglie wave length of the fourth Bohr's orbit of hydrogen atom is 4 Å, the circumference of the orbit is: