NEET 2013
For the following questions answer them individually
In Young’s double slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths $$\lambda_{1}$$ =12000 A and $$\lambda_{2}$$=10000 A. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from oneinterference pattern coincide with a bright fringe from the other?
In acommonemitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the abovetransistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be:
A certain mass of Hydrogen is changed to Helium by the process of fusion. The Mass defect in fusion reactionis 0.02866 u. The energy liberated per u is :
(given 1 u=931 MeV)
Three blocks with masses m, 2 m and 3 m are connected by strings, as shown in the figure. After an upward force F is applied on block m1, the masses move upward at constant speed v. What is the net force on the block of mass 2 m? (g is the acceleration due to gravity)
The half life of a radioactive isotope 'X' is 20 years .It decades to another element 'Y' is 20 years . It decays to another element 'Y' which is stable . The two elements 'X' and 'Y' were found to be in the ratio 1:7 in a sample of a given rock.The age of the rock is estimated to be:
The molar specific heats of an ideal gas at constant pressure and volume are denoted by $$C_{P}$$ and $$C_{V}$$, respectively.
If $$\gamma = \frac{C_{p}}{C_{v}}$$ and R is the universal gas constant , then $$C_{v}$$ is equal to:
The wavelength $$\lambda_{c}$$,of an electron and $$\lambda_{p}$$ of a photon of same energy E are related by :
