- AIs a line spectrum
- BIs a band spectrum
- CIs a continuous spectrum
- DDoes not fall in the visible region
Explanation:
The emission spectrum of CO2 gas that has been studied by the electron beam excitation method is a band spectrum.
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A laser beam of pulse power 1012 watt is focussed on an object are 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is
|
(a) 1020 |
(b) 1016 |
(c) 108 |
(d) 104 |
In circular coil, when no. of turns is doubled and resistance becomes
of initial, then inductance becomes
|
(a) 4 times |
(b) 2 times |
(c) 8 times |
(d) No change |

The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)
|
(a) 2πhc/ |
(b) |
(c) |
(d) 2π |
Intensity of light depends upon
|
(a) Velocity |
(b) Wavelength |
(c) Amplitude |
(d) Frequency |