MCQ
The fringe width in Young’s double slit experiment increases when
- ✓Wavelength increases
- BDistance between the slits increases
- CDistance between the source and screen decreases
- DThe width of the slits increases
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$(I)$ All radioactive elements decay exponentially with time
$(II)$ Half life time of a radioactive element is time required for one half of the radioactive atoms to disintegrate
$(III)$ Age of earth can be determined with the help of radioactive dating
$(IV)$ Half life time of a radioactive element is $50\%$ of its average life periodSelect correct answer using the codes given belowCodes :

