Chapter 15: Communication Systems
15.1 Which of the following frequencies will be suitable for beyond-thehorizon communication using sky waves?(a) 10 kHz(b) 10 MHz(c) 1 GHz(d) 1000 GHz 15.2 Frequencies in the UHF range normally propagate by means of:(a) Ground waves.(b) Sky…
Chapter 14: Semiconductor
14.1 In an n-type silicon, which of the following statement is true:(a) Electrons are majority carriers and trivalent atoms are thedopants.(b) Electrons are minority carriers and pentavalent atoms are thedopants.(c) Holes are minority carriers and pentavalent atoms…
Chapter 13: Nuclei
13.1 (a) Two stable isotopes of lithium 6 3 Li and 7 3 Li have respectiveabundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium. (b)…
Chapter 12: Atoms
12.1 Choose the correct alternative from the clues given at the end ofthe each statement:(a) The size of the atom in Thomson’s model is ………. the atomicsize in Rutherford’s model. (much greater than/no differentfrom/much less than.)(b) In…
Chapter 11: Dual Nature of Radiation and Matter
11.1 Find the(a) maximum frequency, and(b) minimum wavelength of X-rays produced by 30 kV electrons. 11.2 The work function of caesium metal is 2.14 eV. When light offrequency 6 ×1014Hz is incident on the metal surface, photoemissionof…
Chapter 10: Wave Optics
10.1 Monochromatic light of wavelength 589 nm is incident from air on awater surface. What are the wavelength, frequency and speed of(a) reflected, and (b) refracted light? Refractive index of water is1.33. Answer: 10.2 What is the…
Chapter 9: Ray Optics and Optical Instruments
Question 1.A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in…
Chapter 8: Electromagnetic Waves
8.1 Figure 8.6 shows a capacitor made of two circular plates each ofradius 12 cm, and separated by 5.0 cm. The capacitor is beingcharged by an external source (not shown in the figure). Thecharging current is constant…
Chapter 7: Alternating Current
7.1 A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.(a) What is the rms value of current in the circuit?(b) What is the net power consumed over a full cycle? 7.2 (a)…
Chapter 6: Electromagnetic Induction
6.1 Predict the direction of induced current in the situations describedby the following Figs. 6.18(a) to (f ). even if the charges are stationary [and the q (v × B) term of the Lorentzforce is not operative],…
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