Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is _______ ×1013 Hz×1013 Hz (nearest integer). [Given : RH( Rydberg constant )=2.18×10−18 J,h (Plank's  constant )=6.6×10−34 J.s.]

The de Broglie wavelength of an electron in the 4th Bohr orbit is :

Calculate the de- Broglie wavelength for an electron moving at 1.0 x 10^7 m/s.

When electron jumps from nth orbit to 1st orbit in an imaginary atom obeying Bohr’s model, itemits two radiations of wavelengths 400 nm and 300 nm. The frequency of radiation emitted out inthe transition n = n to n = 1 will be

The spectrum from a hydrogen vapour lamp is measured and four lines in the visible light range are observed. These lines are the so-called Balmer series, where an electron makes a transition from a higher level to the second energy level (nl=2).In this series, the transition from nu= 3 to nl= 2 produces the photon with the lowest energy, this corresponds to the line with the longest wavelength. This is measured to be λ = 646.9 nm.What value of the Rydberg constant R is obtained using these measurements?Express you answer in µm-1 to two decimal places

Calculate the de Broglie wavelength of an electron moving at 1/137th the speed of light