3 100 kg 4 100 gm Wavelength of n neutron at temperature 27

Graph is plotted between photo current 1 and applied voltage V Then maximum kinetic energy of emitted electron will be 1 2 eV 4 3 2 1 0 1 V 2 4 eV 2 3 4 3 0 eV 4 1 eV BOAI BO PHYSICS BOON Z E MODERN PHYS Z WODE02 BOA BO PHYSICS AT A GLANCE CROPEN E screen will be 1 0 9 L 3 0 4

22 A small plate of metal work function 1 17 eV is placed at a distance of 2 m from a monochromatic light source of wavelength 4 8 x 1077 m and power 1 0 W The light falls normally on the plate If a constant uniform magnetic field of strength 10 4T is applied parallel to the metal surface find the radius of the largest circular path followed by the emitted photoelectrons in m

Draw the circuit diagram of a half wave rectifier Explain its working What is the frequency of ripple in its output Why do we need filters in a power supply

1 A photoelectron is moving with a maximum velocity of 106 m s Given e 1 6 x 10 9 c and m 9 1 x 10 1 kg the stopping potential is 1 2 5 V 3 2 0 V 2 2 8 V 4 1 4 V

When radiation of frequency 3 x 1015 Hz incident on a metallic surface having work function 4 eV The minimum velocity of photoelectron is 1 1 72 x 106 ms 1 ayon is 3 10 5 KE Wo4ev 2 3 44 106 ms 1 3 6 88 106 ms 1 4 Zero Vmin 2 6 6x10 KE

If Amin is minimum wavelength produced in X ray tube and is the wavelength of k line As the operating tub woltage is increased A increases min 3 increases NUGA 2 A decreases 4 decreases photo electric cell and

2R A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field What should be the energy of an a particle to describe a circle of same radius in the same field 1 2 MeV 2 1 MeV 0 5 MeV 4 4 MeV AIPMT 2012 Mains magnetic field requires J of work to turn it through 60 The torque

37 The diagram shows the energy levels for an electron in a certain atom Which transition shown represents the emission of a photon with the most energy a IV I II b III III IV c II n 4 n 3 n 2 n 1 d I

The threshold frequency for a metallic surface corresponds to an energy of 6 2 eV and the stopping potential for a radiation incident on this surface is 5 V The incident radiation lies in a ultra violet region c visible region b infra red region d X ray region

The spectral emissive power E for a body at temperature T is plotted against the wavelength and area under the curve is found to be A At a different temperature T the area is found to be 9A Then 2 2 1 3 IdE d 2 2 T T 1 2 1 3 ATTE P