When a person sitting on a swing stands up on the swing the frequency of oscillation
1). decreases
2). increases
3). becomes infinite
4). does not change
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1. A photo-electric cell converts
3. Planets are
4. Heavy water is used in nuclear reactor to
5. Which of the following is not a transverse wave?
6. When does land breeze occur?
7. In sunlight a rose appears red. In green light the same rose appears :
8. In optical instrument, the lenses are used to form image by the phenomenon of -