## Question

The mass per nucleon in a heavy hydrogen atom is

### Solution

Slightly greater that the mass per nucleon in an oxygen atom

The oxygen nucleons being more stable, must have greater binding energy per nucleon. Hence there must have been a greater ‘mass defect per nucelon’ in O_{2} compared to heavy hydrogen.

#### SIMILAR QUESTIONS

The ionization energy of the hydrogen atom is given to be 13.6 eV. A photon falls on a hydrogen atom which is initially in the ground state and excites it to the *n* = 4 state. Calculate the wavelength of the photon.

An electron of energy 20 eV collides with a hydrogen atom in the ground state. As a result, the atom is excited to a higher energy state and the electron is scattered with reduced velocity. The atom subsequently returns to its ground state with emission of radiation of wavelength . Find the velocity of the scattered electron.

A proton captures a free electron whose kinetic energy is zero and forms a hydrogen atom of lowest energy-level (*n* = 1). If a photon is emitted in this process, what will be the wavelength of radiation? In which region of electromagnetic spectrum, will this radiation fall? (Ionisation potential of hydrogen atom = 13.6 V, ).

The de Broglie wavelength of a neutron at 927^{o}C is . What will be its wavelength at 27^{o}C?

What is the de Broglie wavelength of an electron of energy 1800 eV? Mass of electron and Planck’s constant .

Moving with the same velocity, which of the following has the longest de Broglie wavelength?

The de Broglie wavelength of an electron moving with a velocity is equal to that a photon. The ratio of the kinetic energy of the electron to that of the photon is

The distance of the closest approach of an alpha particle fired at a nuclear with momentum *p* is *r _{0}*. The distance of the closest approach when the alpha particle is fired at the same nucleus with momentum 2

*p*will be

In the Bohr model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state *n* is

When high energy alpha-particle pass through nitrogen gas, an isotope of oxygen is formed with the emission of particles named *x*. The nuclear reaction is

what is the name of *x*?