6. The electric field at a point associated with a light wave is given by 7. E = 200 [sin(610)t+sin(9105)t] Vm Given: h = 4.14 10-15 eVs If the light fall on a metal surface having a work function of 2.50 eV, the maximum kinetic energy of the photoelectrons will be (a)1.90 eV (b) 3.27 eV (c) 3.60 eV (d) 3.42 eV A capacitor is discharging through a resistor R. Consider in time t the energy stored in the capacitor reduces to half of its initial value and in time t, the charge stored in the capacitor reduces to half of its initial value and in time t the charge stored reduces to one eight of its initial value. The ratio t/t will be (a) 1/2 8. (b) 1/3 (c) 1/4 (d) 1/6 Starting with the same initial conditions, an ideal gas expands form volume V to V in the three different ways. The work done by the gas in W if the process is purely isothermal, W, if 9. the process is purely adiabatic and W3 if the process is purely isobaric. Then, choose the correct option (b) W2 W3 W (c) W1 < W1 < W2 (a) W1 < W2 < W3 (d) W2 < W1 < W3 Two long current carrying conductors are placed parallel to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is 300 T. the equal current flowing in the two conductors is: (a) 30A in the same direction. (c) 60A in the opposite direction. (b) 30A in the opposite direction. (d) 300A in the opposite direction. 10. The time period of a satellite revolving around earth in a given orbit is 7 hours. If the radius of orbit is increased to three its previous value, then approximate new time period of the satellite will be (a) 40 hours (b) 36 hours (c) 30 hours (d) 25 hours