- ✓$3 \times 10^6 V / m$
- B$3 \times 10^8 V / m$
- CZero
- DInfinity
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In vacuum the speed of light depends upon
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(a) Frequency |
(b) Wave length |
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(c) Velocity of the source of light |
(d) None of these |
A 60 watt bulb is hung over the center of a table 4 m × 4 m at a height of 3 m. The ratio of the intensities of illumination at a point on the centre of the edge and on the corner of the table is
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(a) |
(b) 2 / 1 |
(c) 17 / 13 |
(d) 5 / 4 |
The modulation index of an FM carrier having a carrier swing of 200 kHz and a modulating signal 10 kHz is
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(a) 5 |
(b) 10 |
(c) 20 |
(d) 25 |
Plate voltage of a triode is increased from 200 V to 225 V. To maintain the plate current, change in grid voltage from 5V to 5.75 V is needed. The amplification factor is
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(a) 40 |
(b) 45 |
(c) 33.3 |
(d) 25 |
In the above figure D and E respectively represent
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(a) Absorption line of Balmer series and the ionization potential of hydrogen |
|
(b) Absorption line of Balmer series and the wavelength lesser than lowest of the Lyman series |
|
(c) Spectral line of Balmer series and the maximum wavelength of Lyman series |
|
(d) Spectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series |