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…
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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…
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…
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)…
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…
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…
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…
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…
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…
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)…
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],…
5.1 Answer the following questions regarding earth’s magnetism:(a) A vector needs three quantities for its specification. Name thethree independent quantities conventionally used to specify theearth’s magnetic field.(b) The angle of dip at a location in southern India…