## Question

### Solution

Correct option is

Proton

The charge number and the mass number must be the same on both sides of a nuclear reaction. Particle x must have charge number +1 and mass number 1. Hence it is a proton.

#### SIMILAR QUESTIONS

Q1

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.  Q2

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 ).

Q3

The de Broglie wavelength of a neutron at 927ois . What will be its wavelength at 27oC?

Q4

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

Q5

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

Q6

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

Q7

The distance of the closest approach of an alpha particle fired at a nuclear with momentum p is r0. The distance of the closest approach when the alpha particle is fired at the same nucleus with momentum 2p will be

Q8

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

Q9

The mass per nucleon in a heavy hydrogen atom is

Q10

The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is 0. The distance of the closest approach when the alpha particle is fired at the same nucleus with kinetic energy 2K will be