Physics Test - ...

Calculate the wavelength of radiation emitted when He⁺ makes a transition from the state n = 4 to the state n = 3.

A solid cylindrical conductor of radius \(R\) has a uniform current density \(I\). The magnetic field \(H\) inside the conductor at distance \(r\) from the axis of the conductor is:

Which of the following are quick electron emissions?

If a unit positive charge is placed inside a sphere of radius \(r\), then the electric flux through the sphere will be:

When an inductive load is connected, the power factor is:

In a periscope, the two plane mirrors are kept

If two unit masses are placed at unit distance apart the force of attraction between them is equal to _____.

An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage \(5 \mathrm{~V}\) and separation distance \(\mathrm{h}=1 \mathrm{~mm}\). Calculate the time of flight for both electron and proton:

What amount of heat must be supplied to \(2.0 \times 10^{-2} kg\) of Nitrogen (at room temperature) to raise its temperature by \(45^{\circ} C\) at constant pressure? (Molecular mass of \(\left.N_{2}=28 ; R=8.3 J m o l^{-1} K^{-1} .\right)\)

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at \(-20^{\circ} \mathrm{C} ?\) (Atomic mass of \(\mathrm{Ar}=39.9 \mathrm{u}\) and \(\mathrm{He}=440 \mathrm{u})\)