Physics 2nd Paper CQ-Dhaka Board-2023

Define mean life.

"Minimum wavelength of X-ray produced by X-ray tube depends on applied voltage between cathode and anode of that tube".- Explain.

Find the mass defect of the fusion reaction.

Mathematically verify whether the energy released in the fusion is capable to break the alpha particle fully.

Define 1 coulomb charge.

Why electromotive force of a cell does not affect fully in a circuit? Explain.

Calculate current of the circuit when galvanometer is cutoff.

Is it possible to get an equilibrium position if ' $X$ ' $\Omega$ resistances of the stem is used with any one of the resistances given in the bridge? Justify mathematically.

What is coherent source?

Nature of wave front depends on the distance from source-Explain.

Calculate the distance between two successive bright fringes.

What type of interference will be found in the point 'P'? Explain mathematically.

What is called depletion layer?

Why n-p-n transistor is more effictive than p-n-p transistor?

Write the truth table of circuit-1.

Will it form any logic gate when a NOT gate is connected with the logic gate of the stimulus truth table? Explain with diagram and truth table.

What is called internal energy?

During adiabatic expansion the system becomes cold.Explain it.

What is the change in internal energy in the thermodynamic system to come at position 'R' according to the stem?

Compare the work done in each step of $\mathrm{PQRP}$ cycle according to the stem.