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प्रश्न
Name the particles that constitute the cathode rays. State some properties of cathode rays.
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उत्तर
Cathode rays are made up of electrons—the fundamental negatively charged particles. These rays have the following properties, among others.
(i) They can affect photographic plates and produce fluorescence in materials like zinc sulphide.
(ii) They carry momentum and energy.
(iii) They are deflected by electric and magnetic field in the sense in which negatively charged particles are deflected.
संबंधित प्रश्न
Name the three constituents of an atom and state their mass and charge of each. How are they distributed in an atom?
Define the term atomic number.
Define the term mass number.
A nucleus \[\ce{^194_82X}\] emits an alpha particle
- What will be the atomic number of the daughter nucleus Y?
- What will be the number of neutrons in the daughter nucleus Y?
- Write a nuclear reaction showing the emission of this particle.
Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model, The ratio \[\frac{R_1}{R_2}\] is:
Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atom, respectively. According to the Bohr’s model of an atom, the ratio T1: T2 is:
A nucleus of mass number of 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is:
Existence of positively charged nucleus was established by:
If the mass number of a nucleus is doubled, its radius becomes:
