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 $1m$. Let the average speed of electrons be $3\times {10}^{7}m{s}^{-1}$, for a thermal neutron $2.2\times {10}^{5}m{s}^{-1}$, for a neon atom $5.8\times {10}^{2}m{s}^{-1}$ and for an oxygen molecule $4.6\times {10}^{2}m{s}^{-1}$. The beams move through vaccuum horizontally with initial velocities mentioned above. A golf ball is also projected horizontally with $20m{s}^{-1}$ in vacuum.

Find the deviation of golf in travelling through $2m$

• A. $2cm$
• B. $5cm$
• C. $8cm$
• D. $3.6cm$

Answer 1

The correct option is B $5cm$

For the golf ball, time travel horizontal distance of 2m is $t=\frac{2}{20}=0.1secs$
In this time, vertical deviation is $\frac{1}{2}g{t}^2=\frac{1}{2}\times 10\times (0.1{)}^2=0.05m=5cm$