AGARWALS PHYSICS RAVI AGARWAL (M.Sc.) 9913650950 / 9374727052TIME: 1Hr.30 min. CH. 9 TO 16 Marks: 50Q.I Very short answer question each carries 1 mark (16) 1 What is the wavelength of radiation being absorbed by Ozone layer?2 What is threshould frequency?3 Give equation of mass for photon in terms of h, f and c.4 What was the contribution of Frisch?5 For which metals the nuclear radius estimated to be 10-14m?6 Binding energy per nucleon is a measure of the ___________ of the nucleus.7 Which type of satellite is used for spying?8 Which transistor is called BJT?9 What was the name given to the two elements isolated from the uranium ore-Pitch Blende?10 What is the width of depletion region?11 What is interference?12 Which electronic circuit can be used as a voltage regulator circuit?13 What is the reason for the characteristics curve obtain in the X-ray spectrum obtained?14 What was the contribution of Grimaldy in the field of wave optics?15 Give the Boolean equation for NAND Gate?16 In Davisson-Germer experiment, the electron gun having tungsten filament is coated with what material? Q.III Short answer question each carries 2 marks (16) 17 With the help of block diagram, explain in short the working of digital communication. 18 Describe: Refraction of light according to Huygenss wave theory. 19 Obtain Malus law I = and explain the usage of tourmaline plate as a analyser. 20 What is artificial nuclear transmutation? What is Q-value? And what do you mean by endorgenic and exorgenic process? 21 With the help of a schematic figure, explain the arrangement of Hertzs experiment and show how it forms an oscillator circuit. 22 Explain electrical conductivity of the semiconductor on the basis of energy levels (or band structure) 23 Write down the formula of path difference for interference occurs by two coherent sources. And determine the distance between two consecutive bright fringes. 24 Define half life time of a radioactive substance, deduce the necessary expression for it accepting the equation N = .

AGARWALS PHYSICS RAVI AGARWAL (M.Sc.) 9913650950 / 9374727052Q.IV Short answer question each carries 3 marks (18) 25 A fish is at some depth in a lake. It is at horizontal distance R=1.5m from the edge of a lake. If it is just able to see a tree on the edge of the lake what is its depth? Refractive index of water = 1.33. 26 Light of wavelength 5000 is incident on a slit of width 2mm in Fraunhoffer diffraction. Find the width of 2nd maximum on the screen placed at the focal plane of the lens of focallength 100cm. The lens is placed closed to the slit. 27 Calculate the maximum wavelength of Balmer series in the hydrogen spectrum. Calculate the corresponding wave number. (Rydberg constant = 1.097 107m 28 Obtain the relation between the object distance, image distance in focallength for concave mirror. 29 The collector supply voltage in a CE transistor amplifier is equal to 10V. The base current is equal to 10A in the absence of the signal voltage and voltage between the collector and the emitter is equal to 4V. The current gain of the transistor is equal to 300. Calculate the value of the load resistance RL. 30 Draw the circuit diagram for N-P-N-CE transistor as an amplifier and obtain the expression for input, output and voltage gain.ALL THE BEST