Download App

Wave Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWave Optics1 Mark
MCQ
Due to Doppler's effect, the shift in wavelength observed is $0.1 \mathring A$ for a star producing wavelength $6000 \mathring A$. Velocity of recession of the star will be
  • A
    $2.5 km / s$
  • B
    $10 km / s$
  • ✓
    $5 km / s$
  • D
    $20 km / s$
✓

Answer

Correct option: C.
$5 km / s$
$\frac{\Delta \lambda}{\lambda}=\frac{v}{c}$.
$\therefore v=\frac{\Delta \lambda}{\lambda} c=\frac{0.1}{6000} \times 3 \times 10^5 km / s =5 km / s$

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 "MCQ" from Wave Optics→Wave Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A pendulum bob of mass $50 gm$ is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately
→
The intensity of radiation emitted by the sun has its maximum value at a wavelength of $510 \mathrm{~nm}$ and that emitted by the north star has the maximum value at $350 \mathrm{~nm}$. If these stars behave like black bodies, then the ratio of the surface temperature of the sun and north star is
→
Spherical aberration in a lens
→
An electron is accelerated through a potential difference of $1000$ volts. Its velocity is nearly
→
The longitudinal strain is only possible in
→
While tuning in a certain broadcast station with a receiver, we are actually
→
The intrinsic semiconductor becomes an insulator at
→
A galvanometer coil has a resistance $90\, \Omega$ and full scale deflection current $10\, mA$ . A $910\,\Omega$ resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is $0.1\,V$, the number of divisions on its scale is
→
The ozone layer absorbs
→
Which of the property makes difference between progressive and stationary waves
→