41.

An electron of mass m with an initial velocity $\overrightarrow{V} = V_o\hat{i} (V_o>0)$ enters an electric field $\overrightarrow{E} = - E_o \hat{i}$ (E₀ constant >0) at t = 0. if λ₀ is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is

• $\frac{{\lambda }_0}{\left(1+{\displaystyle \frac{e{E}_0}{m{V}_0}}t\right)}$

• ${\lambda }_o\left(1 + \frac{e{E}_0}{m{V}_0}t\right)$

• ${\lambda }_0$

• ${\lambda }_{0}t$

When the light of frequency 2v₀ (where v₀ is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v₁. When the frequency of the incident radiation is increased to 5v₀, the maximum velocity of electrons emitted from the same plate is v₂. The ratio of v₁ to v₂ is

• 1:2

• 1:4

• 2:1

• 4:1

In the combination of the following gates the output Y can be written in terms of inputs A and B as

In the circuit shown in the figure, the input voltage V_i is 20 V, V_BE = 0 and V_CE = 0. The values of I_B, I_C and β are given by

• I_B = 40 μA, I_C = 10 mA, β = 250

• I_B = 25 μA, I_C = 5 mA, β = 200

• I_B = 40 μA, I_C = 5 mA, β = 125

• I_B = 20 μA, I_C = 5 mA, β = 250

In a p-n junction diode, change in temperature due to heating

• Affects only reverse resistance

• Affects only forward resistance

• Affects the overall V - I characteristics of p-n junction

• Does not affect resistance of p-n junction