Download App

Nuclei — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsNuclei2 Marks
Question
Define-
(i). Radio Activity$\quad$$\quad$(ii). Mass defect
✓

Answer

(i) Radio Activity: Spontaneous emission of alpha, beta, or gamma radiations from unstable nuclei to achieve stability.
(ii) Mass Defect: The difference between the sum of masses of individual nucleons and the actual rest mass of the nucleus.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Nuclei→Nuclei — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

A parallel-plate capacitor is filled with a dielectric material of resistivity ρ and dielectric constant K. The capacitor is charged and disconnected from the charging source. The capacitor is slowly discharged through the dielectric. Show that the time constant of the discharge is independent of all geometrical parameters like the plate area or separation between the plates. Find this time constant.
→
How resistivity of material depends on its temperature. Write its empirical formula.
→
What is the principle of superposition of charges?
→
A 1.0 m long metallic rod is rotated with an angular frequency of 400 rad$s ^{-1}$ about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field of 0.5 T parallel to the axis exists everywhere. Calculate the emf developed between the centre and the ring.
→
An electron gun emits $2.0 \times 10^{16}$ electrons per second. What electric current does this correspond to?
→
Distinguish between 'intrinsic' and 'extrinsic' semiconductors.
→
What is paramagnetic substance?
→
What information would you wish to know about the galvanometer before converting it into an ammeter or voltmeter?
→
During an experiment, an ideal gas is found to obey an additional law $pV^2 =$ constant. The gas is initially at a temperature $T$ and volume $V.$ Find the temperature when it expands to a volume $2V.$
→
  1. Why are infra-red waves often called heat waves? Explain.
  2. What do you understand by the statement, ‘‘Electromagnetic waves transport momentum’’?
→