Rajasthan Board Senior Secondary Examination 2010 – Physics Paper II

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1(i)The average intensity of interference pattern obtained from two coherent sources of same intensity I 0 will be

(A) I 0                                                 (B) 2 I 0
(C) 4 I 0                                              (D) 0.                                               1/2

(ii)The expression for orbital angular momentum in l th subshell of an electron will be

(A)h/2π √l ( l + 1 )                         (B)2π/h √l ( l + 1 )
(C)2π/l √h ( l + 1 )                          (D)2π/h √(l +1/l).                       1/2

(iii)Conduction in semiconductor is

(A) unipolar                                      (B) bipolar
(C) tripolar                                        (D) non-polar.                               1/2

(iv) Wave of the highest penetration power is

(A) infrared wave                           (B) ultraviolet wave
(C) X-ray                                            (D) gamma ray.                            1/2

2. Why is the phenomenon of polarisation is not observed in sound waves ? 1/2

3. Radius of third orbit of hydrogen atom is 4·77 Å. Find the radius of its first orbit. 1/2

4. Write the name of crystal structure of intrinsic semiconductor. 1/2

5. Why are microwaves more suitable for sky wave propagation ? 1/2

6. Write any two differences between diffraction and interference of light. 1

7. Draw neat and labelled diagram of an apparatus used in Thomson’s method to determine specific charge of an electron. 1

8. Find out the ratio of accelerating electric potential V α and V p for equal de Broglie wavelength of alpha particle and proton. 1

9. Draw labelled diagram to determine the value of Planck’s constant using photocell and the curve between stopping potential and frequency of incident light. 1/2 + 1/2 = 1

10. Write any two properties of nuclear force. 1

11. Define electric oscillator. Write the names of oscillators on the basis of frequency range. 1

12. Two-input OR gate and two-input AND gate experiments have one output. Write the two stages of input signals when output signal is same for both the gates. 1

13. How is ionosphere is formed ? What is its use ? 1

14. Explain the reflection of light by Huygens’ wave theory. Give necessary diagram. 1 1/2 + 1/2 = 2

15. An oil drop of diameter 10^ – 6 metre and 880·5 kilogram/metre³ remains stationary between the plates separated by a distance of 10 millimetre. The potential difference between plates is 36 volt. Find the number of electrons on the oil drop. ( g = 10 m/sec² ). 2

16.Obtain an expression for cut-off wavelength in X-ray continuous spectrum. Write the type of X-rays of 0·01 Å wavelength. 1 1/2 + 1/2 = 2

17.  Give explanation of Bohr’s quantum condition on the basis of the principle of matter waves. 2

18. (i) Write Heisenberg’s uncertainty principle.

(ii) Why the cathode of photoelectric cell is of large surface area and cesium coated ? 1 +1/2+ 1/2= 2

19.Average life of Thorium-227 is 2·74 years and activity is 37 rutherford. Find out the mass of Thorium-227.   2

20.(i) How is voltage regulation done for unregulated power supply ?

(ii) Average value of potential barrier for P-N junction is 0·36 volt. Electric field present at that junction is 1·8 × 10² kilovolt/metre. What will be the thickness of depletion layer for this junction ? 1 + 1 = 2

21. Prove that electromagnetic waves are transverse in nature. Write the formula of energy flux vector of electromagnetic waves. 1½+ ½= 2

22. How does atomic number change in β-particle emission ? Explain conservation of energy and conservation of angular momentum in β-decay by neutrino hypothesis.

Draw the curve between binding energy per nucleon and mass number. Show the range of mass number where nuclei are most stable. 1 + 2 + ½+ ½ = 4

23. Define coherent sources. How are they produced in Fresnel’s biprism ? Draw the labelled diagram of Fresnel’s biprism experiment and derive the formula for determination of  wavelength of monochromatic light. ½+ ½+ 1 + 2 = 4

OR

Define diffraction. Why is diffraction easily observed in sound than light ? Draw neat and labelled diagram of Fresnel’s n th half period zone and determine area of the nth Fresnel’s half  period zone when higher order powers of wavelength is not neglected. ½+ ½ + 1 + 2 = 4

24. How is P-N junction diode fabricated ? Explain reverse biasing of junction diode by drawing experimental labelled circuit diagram. Give relation between bias voltage and current for forward bias and reverse bias. 1 + 1 + 1 + 1 = 4

OR

Draw the experimental labelled circuit diagram for P-N-P transistor in common emitter configuration. Explain active region in output characteristic curves. Define reverse dynamic resistance and dynamic current amplification factor. 1 + 2 + ½+ ½= 4