Advertisements
Advertisements
प्रश्न
When is said to be the nucleus unstable?
Advertisements
उत्तर
The nucleus is said to be unstable when radiations (alpha, beta, gamma rays) are emitted by the nucleus.
APPEARS IN
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
A nucleus `""_11^24Na` emits a beta particle to change into Magnesium (Mg)
(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of `""_12^24Mg `with respect to `""_11^24Na` ?
What do you mean by Atomic number
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
A radioactive nuclide `""_86^226` Ra decays by emission of two alpha particles, one beta particle and gamma rays. Which of the following is the resulting nuclide X?
A radioactive nucleus `""_"Z"^"A"` X first emits a beta particle and then an alpha particle to give the resulting nucleus `""_"Q"^"P"` Y What will be the values of P and Q in terms of A and Z?
What happens to the position of an element in the periodic table when it emits an alpha particle
Define free electrons.
How is a cathode ray beam affected while passing through an electric field?
State any two uses of cathode rays.
State three common properties of beta rays and cathode rays.
From α, β and γ-rays, name the one which travels with the speed of light?
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
A radioactive material decays by simultaneous emissions of two particles with half-lives of 1400 years and 700 years respectively. What will be the time after which one-third of the material remains? (Take In3 = 1.1)
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.
Reason (R): Rutherford did α-particles scattering experiment.
