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Question

Electrons, nuclei, atoms and molecules like all forms of matter, will fall under the influence of gravity. Consider separately the beam of electrons, of nuclei, of atoms and of molecules travelling a horizontal distance of 1 m. Let the average speed of electrons be 3×107ms1, for a thermal neutron 2.2×105ms1, for a neon atom 5.8×102ms1 and for an oxygen molecule 4.6×102ms1. The beams move through vaccuum horizontally with initial velocities mentioned above. A golf ball is also projected horizontally with 20 ms1 in vacuum.
Find the deviation of golf in travelling through 2 m

A
2 cm
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B
5 cm
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C
8 cm
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D
3.6 cm
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Solution

The correct option is B 5 cm
For the golf ball, time travel horizontal distance of 2m is t=220=0.1secs
In this time, vertical deviation is 12gt2=12×10×(0.1)2=0.05m=5cm

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