For a transistor amplifier the voltage gain A is low at high

A nucleus of mass number 220 initially at rest emits an a particle If the Q value of the reaction is 5 5 MeV the energy of the emitted a particle will be 1 4 8 MeV 2 5 4 MeV 3 7 5 MeV 4 6 8 MeV An open container has net 10 gm mass of a radioactive material The net mass in the container after two mean lives is approximately 1 1 35 gm 2 2 5 gm

15 The figure represents the observed intensit of X rays emitted by an X ray tube as function of wavelength The sharp peaks and B denote Intensity A B Wavelength a white radiations b characteristic radiations band spectrum 12 centinous spectrum

The antenna current produced by an unmodulated carrier is 2 7 A into n antenna with a resistance of 300 ohm When amplitude modulated the antenna burrent rises to 3 A What is the percentage of modulation 68 49 84 69 86 49

1 1 Which of the following wavelength is not possible for an X ray tube which is operated at 40 1 0 25 2 0 5 3 0 52 4 IA

For the structural analysis of crystals X rays are used because 1 X rays have wavelength of the order of the inter atomic spacing 2 X rays are highly penetrating radiations 3 Wavelength of X rays is of the order of nuclear size 4 X rays are coherent radiations

Q No 85 to 86 A crystal belongs to a face centered cubic lattice with four atoms in the unit cell The size of the crysta is 1 cm and its unit cell dimension is 1 nm is the scattering factor of the atom The number of atoms in the crystal is 4 a 2 10 1 c 2 x 1023 The structure factors for 010 and 200 reflections respectively are a 2f and zero b zero and 4f c 2f and 2f d zero and zero b 4 10 d 4 x 1024 2

The Ka wavelength of an element with atomic number z is X The ka wavelength of an element with atomic number 2z is A2z How are Az and A2z related ONO Az 4A2z A 4X22 Az 4X22

9 A p n photodiode is made of material with a band gap of 2 eV The minimum frequency of the radiation that can be absorbed by the material is nearly h 6 6 x 1034 the be 1 10 x 10 Hz 2 5 x 10 4 Hz 3 1 x 10 Hz 4 20 x 10 4 Hz

Q14 A beam of electrons of velocity 6 00 x 10 m s is made to strike a metal target in the Coolidge tube to produce x rays The minimum wavelength of the x ray is O A 0 121 nm O B 0242 nm c 0 024 nm D 0 012 nm

SolveLancer Test The photon concept was confirmed by Compton Experiment Consider statements about this experiment 1 This experiment showed that photon model applied only to UV light ii The collision between X ray photon and electron is Inelastic collision iii Compton effect is observable with Yellow light iv The scattered X ray photon has less frequency Select correct option SolveLancer Test a Both 1 and iii correct b Only ii correct c Only iv correct d Both ii and iv correct a Ob