Data Entry - Physics

Which of the following is associated with pneumonia?

$A$ photon collides with a stationary hydrogen atom in the ground state inelastically. The energy of the colliding photon is $10.2 \, eV$. After a time interval of the order of a microsecond,another photon collides with the same hydrogen atom inelastically with an energy of $15 \, eV$. What will be observed by the detector?

Which of the following acts as both an oxidizing agent and a reducing agent?

Arrange the following in order of increasing dipole moment : $H_2O$,$H_2S$,$BF_3$.

Water from a tap emerges vertically downwards with initial velocity $4 ~m/s$. The cross-sectional area of the tap is $A$. The flow is steady and pressure is constant throughout the stream of water. The distance $h$ vertically below the tap,where the cross-sectional area of the stream becomes $\frac{2}{3} A$,is $(g=10 ~m/s^2)$ (in $~m$)