Download App

Atoms — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsAtoms2 Marks
Question
According to the classical electromagnetic theory, calculate the initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom.
✓

Answer

From Example 12.3 we know that velocity of electron moving around a proton in hydrogen atom in an orbit of radius $5.3 \times 10^{-11} m$ is $2.2 \times 10^{-6} m / s$. Thus, the frequency of the electron moving around the proton is
$
\begin{array}{r}
v=\frac{v}{2 \pi r}=\frac{2.2 \times 10^6 m s ^{-1}}{2 \pi\left(5.3 \times 10^{-11} m \right)} \\
\approx 6.6 \times 10^{15} Hz .
\end{array}
$
According to the classical electromagnetic theory we know that the frequency of the electromagnetic waves emitted by the revolving electrons is equal to the frequency of its revolution around the nucleus. Thus the initial frequency of the light emitted is $6.6 \times 10^{15} Hz$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Atoms→Atoms — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A man moves on a straight horizontal road with a block of mass 2kg in his hand. If he covers a distance of 40m with an acceleration of 0.5m/s2, find the work done by the man on the block during the motion.
→
Can we conclude from the interference phenomenon whether light is a transverse wave or a longitudinal wave?
→
The focal length of a convex lens made of glass is 20cm. What will be its new focal length when placed in a medium of refractive index 1.25?
→
An inductor is connected to a battery through a switch. Explain why the emf induced in the inductor is much larger when the switch is opened as compared to the emf induced when the switch is closed.
→
A wire, carrying a current i, is kept in the x−y plane along the curve $\text{y}=\text{A}\sin\Big(\frac{2\pi}{\lambda}\text{x}\Big).$ A magnetic field B exists in the z direction. Find the magnitude of the magnetic force on the portion of the wire between $\text{x}=0$ and $\text{x}=\lambda.$
→
An $\alpha$-particle and a proton are accelerated through the same potential difference. Find the ratio of their de Broglie wavelength.
→
Derive the equation of electric potential due to a system of electric charges.
→
Suppose $\vec{\text{a}}$ is a vector of magnitude 4.5 unit due north. What is the vector:
  1. $3\vec{\text{a}}$
  2. $-4 \ \vec{\text{a}}?$
→
A galvanometer cannot be used directly to measure current - why ? Explain the solution of this problem.
###
State the difficulties occured and their solution when galvanometer is directly used as ammeter.
→
An equilateral glass prism has a refractive index 1.6 in air. Calculate the angle of minimum deviation of the prism, when kept in a medium of refractive index $\frac{4\sqrt2}{5}.$
→