Some laws / processes are given in Column I. Match these with the physical phenomena given in Column II and indicate your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS.
← IIT-JEE 2007 · Paper 1
PhysicsMatrix match+6Question 22 of 66
IIT-JEE 2007 · Paper 1, Physics question 22
Column I
- ATransition between two atomic energy levels
- BElectron emission from a material
- CMosley's law
- DChange of photon energy into kinetic energy of electrons
Column II
- PCharacteristic X-rays
- QPhotoelectric effect
- RHydrogen spectrum
- S-decay
| P | Q | R | S | |
|---|---|---|---|---|
| A | ||||
| B | ||||
| C | ||||
| D |
Answer and worked solution
Official answer: A → P, R; B → Q, S; C → P; D → Q
- A, transitions between atomic levels: produce characteristic X-rays (inner levels) and the hydrogen spectrum. → P, R.
- B, electron emission from a material: photoelectric effect and β-decay (an electron emitted by a nucleus). → Q, S.
- C, Moseley's law relates the frequency of characteristic X-rays to atomic number. → P.
- D, photon energy into electron kinetic energy: the photoelectric effect. → Q.
Answer: A → P, R; B → Q, S; C → P; D → Q