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A narrow beam of white light goes through a slab having parallel faces.
Assertion : In Young’s experiment, the fringe width for dark fringes is different from that for white fringes.
Reason : In Young’s double slit experiment the fringes are performed with a source of white light, then only black and bright fringes are observed.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The decay constant of radium is 4.28 
per year. Its half life will be
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(a) 2000 years |
(b) 1240 years |
(c) 63 years |
(d) 1620 years |
If the wavelength of the first line of the Balmer series of hydrogen is 6561 
, the wavelength of the second line of the series should be
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(a) 13122 |
(b) 3280 |
(c) 4860 |
(d) 2187 |