MCQ
How does the red shift confirms that the universe is expanding
- ADue to Wien's law
- BDue to Stefan's law
- CDue to Kirchhoff's law
- ✓Due to Doppler's effect
✓
Answer
Correct option: D.
Due to Doppler's effect
If the light received from galaxies indicates a shift towards the red end of spectrum of light, it means that the galaxies should be receding away (Doppler's effect). Therefore we conclude that the universe is expanding.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$1 eV$ is
→Far points of myopic eye is $250 \mathrm{~cm}$, then the focal length of the lens to be used will be
→Two identical samples of a gas are allowed to expand $(i)$ isothermally $(ii)$ adiabatically. Work done is
→Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
A mass ' $m$ ' moves with a velocity ' $v$ ' and collides inelastically with another identical mass. After collision the lst mass moves with velocity $\frac{v}{\sqrt{3}}$ in a direction perpendicular to the initial direction of motion. Find the speed of the 2 mass after collision
→
Dimensions of permeability are
Rest mass energy of an electron is $0.51 \mathrm{MeV}$. If this electron is moving with a velocity $0.8 c$ (where $c$ is velocity of light in vacuum), then kinetic energy of the electron should be.
→Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in 20 minutes and 30 minutes. The ratio of their thermal conductivities will be
Let $\vec{A}=\hat{i} A \cos \theta+\hat{j} A \sin \theta$ be any vector. Another vector $\vec{B}$ which is normal to $A$ is
→Through which character we can distinguish the light waves from sound waves