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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsX-raysMedium2 minQB

PhysicsMediumsingle choice

A helium ion and a hydrogen ion are accelerated from rest through a potential difference of v to velocities of $U_{He}$ and $U_{H}$ respectively. If the helium has lost one electron, what is the ratio of $\frac{U _{He}}{U _{H}}$

Options:

Answer:

Solution:

Both ions carry charge $+ e; q V = \frac{1}{2} m U^{2}$ .

$U = \frac{2 q V}{m} \Rightarrow \frac{U _{He}}{U _{H}} = \frac{m _{H}}{m _{He}} = \frac{1}{4} = \frac{1}{2} .$

Subject:PhysicsTopic:Modern PhysicsSubtopic:X-rays

⏱ 2mℹ️ Source: QB

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