A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength 5500 Å is
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(a) 4400 Å |
(b) 1833 Å |
(c) 3167 Å |
(d) 7333 Å |
(c) 3167 Å
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In beta decay
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(a) The parent and daughter nuclei have same number of protons |
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(b) The daughter nucleus has one proton less than the parent nucleus |
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(c) The daughter nucleus has one proton more than the parent nucleus |
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(d) The daughter nucleus has one neutron more than the parent nucleus |
A change of 0.8 mA in the anode current of a triode occurs when the anode potential is changed by 10 V. If m = 8 for the triode, then what change in the grid voltage would be required to produce a change of 4 mA in the anode current
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(a) 6.25 V |
(b) 0.16 V |
(c) 15.2 V |
(d) None of these |
In double slit experiment, the angular width of the fringes is 0.20o for the sodium light (λ =5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is
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(a) Increase of 589 Å |
(b) Decrease of 589 Å |
(c) Increase of 6479 Å |
(d) Zero |
Which of the following statement is correct
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(a) Liquids obey fully the ohm's law |
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(b) Liquids obey partially the ohm's law |
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(c) There is no relation between current and p.d. for liquids |
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(d) None of the above |
The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first
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(a) b > (d = e) < (a = c) |
(b) b > (d = e) > (a = c) |
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(c) b < d < e < c < a |
(d) b > (a = c) > (d = e) |
Two capacitors of 10 μF and 20 μF are connected in series with a 30V battery. The charge on the capacitors will be, respectively
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(a) 100 μC, 200 μC |
(b) 200 μC, 100 μC |
(c) 100 μC, 100 μC |
(d) 200 μC, 200 μC |