Solve your IGNOU Doubts

Question:

Using steps 1 to 5 given in Sec. 3.7 of Unit 3, draw the Lewis structures of $BrF_5$ and $XeF_2.$ Using VSEPR theory, predict their shapes.

See Answer →

Question:

b) Assume that the electron in $Li^{2+}$ ion is in third orbit. Calculate

i) the radius of the orbit, and

ii) the total energy of the electron

[Hint: $Li^{2+}$ ion also has atomic spectra similar to hydrogen atom. while applying relevant equations, use Z = 3.]

See Answer →

Question:

a) Calculate the ionisation energy of rubidium per atom, if light of wavelength $5.84\times 10^{-8}m$ ) Calculate the ionisation energy of rubidium per atom, if light of wavelength 5.84  108 m produces electrons with a speed of $2.450\times 10^{6}\,ms^{-1}.$

[Hint: Assume that the threshold frequency refers to the frequency corresponding to the ionisation energy.]

See Answer →

Question:

Using Rodrigue’s formula, obtain expression for $H_3(x)$ and show that $H^{'}_3(x)=6H_2(x).$

See Answer →

Question:

Using the following expression for a Bessel function of order m:

$J_{m}(x)=\sum_{k=0}^{\infty}(-1)^{k}\;\frac{1}{k!\Gamma(m+k+1)}\biggl(\frac{x}{2}\biggr)^{2k+m}$

show that

$J_{2}(x)=\frac{2}{x}\,J_{1}(x)-J_{0}(x)$

See Answer →

Question:

Expand the function $f(x)=x^4$ in a series of the form $\sum_{k=0}^{\infty }A_kP_k(x).$ .

See Answer →

Question:

b) What is blue tooth technology? What are the concerns regarding the interference among blue tooth connections? How are they resolved?

See Answer →

Question:

a) What is the difference between Internet and intranet? What are the advantages of intranet?

See Answer →

Question:

b) Explain the different types of client-server network architecture.

See Answer →

Question:

a) Explain the process of instruction execution in a van Neumann machine.

See Answer →

Question:

b) Compare LED and laser diode used as sources in optical fibre communication.

See Answer →

Question:

a) With the help of appropriate diagram, explain the difference between E-plane and H-plane T-structures of the waveguide.

See Answer →

Question:

b) Discuss the advantages of FM over AM in radio transmission. What are the essential differences between AM and FM receiver circuits?

See Answer →

Question:

a) What are the functions of synchronizing circuits in a television receiver? How are these functions accomplished by using a sync separator circuit?

See Answer →

Question:

b) Design a TDM system to handle 3 PAM channels if the maximum input frequency of each channel is 50 kHz.

See Answer →

Question:

a) Explain the time division switching used in telephony.

See Answer →

Question:

b) Depict digital signal 101101001 in (i) unipolar RZ, (ii) bipolar NRZ, (iii) bipolar RZ, and (iv) Manchester code.

See Answer →

Question:

Using the method of Laplace transform, solve the following initial value problem:

$y^{\prime\prime}-6y^{\prime}+5y=0;\ \ y(0)=1,\ \ \ y^{\prime}(0)=-3$

See Answer →

Question:

a) 10 kHz audio signal is amplitude modulated over a 100 kHz carrier frequency. The peak amplitude of carrier wave is 10 V. If the modulation index is 0.8, find out the frequencies present in the modulated output. Also calculate the maximum and the minimum amplitude of the envelope of modulated signal

See Answer →

Question:

b) You have an open ended line of $3\lambda /4$ length. Draw the incident, reflected and resultant voltage and current waves for the current maximum at generator end.