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AIPMT 2010 Physics
Q. 20. The energy of a hydrogen atom in the ground state is − 13.6 eV. The energy of a He+ ion in the first excited state will be:
- − 13.6 eV
- − 27.2 eV
- − 54.4 eV
- − 6.8 eV
Sol.
Answer : (1)
Q. 21. The dimension of
, where ε0 is permittivity of free space and E is electric field, is:
Sol:
Answer : (2)
Q. 22. A man of 50 kg mass is standing in a gravity free space at a height of 10 m above the floor. He throws a stone of 0.5 kg mass downwards with a speed 2 m/s. When the stone reaches the floor, the distance of the man above the floor will be:
- 9.9 m
- 10.1 m
- 10 m
- 20 m
Sol: By momentum conservation,
50 u + 0.5 x 2 = 0
Answer : (2)