MCQ
Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
  • A
    Einstein mass - energy relation
  • Einstein theory of relativity
  • C
    Photoelectric effect
  • D
    None of these

Answer

Correct option: B.
Einstein theory of relativity
b
(b)With reference to this theory the velocity of the observer is neglected w.r.t. the light velocity.

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

Similar questions

In a circuit inductance $L$ and capacitance $C$ are connected as shown in figure. $A_1$ ​and $A_2$​ image are ammeters. When key $K$ is pressed to complete the circuit, then just after closing key $(K)$, the readings of $A_1$ ​and $A_2$ will be
The magnetic susceptibility of a material of a rod is $499 .$ Permeability in vaccum is $4 \pi \times 10^{-7}\; {H} / {m}$. Absolute permeability of the material of the rod is $....\,\pi \times 10^{-4} {H} / {m}$
A long magnetic needle of length $2\,L$, magnetic moment $ M$  and pole strength $m$ units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be
Two liquids $A$ and $B$ are at $32°C$ and $24°C$. When mixed in equal masses the temperature of the mixture is found to be $28°C$. Their specific heats are in the ratio of
Two paper screens $A$ and $B$ are separated by a distance of $100\,m$. A bullet pierces $A$ and then $B$. The hole in $B$ is $10\,cm$ below the hole in $A$. If the bullet is travelling horizontally at the time of hitting $A$, then the velocity of the bullet at $A$ is $.......\,m / s$
A plane glass is kept over a coloured word '$VIBGYOR$', where colour of letters as same as the colours in white light start by letter, the letter which appears least raised is
If the direction of the initial velocity of the charged particle is neither along nor perpendicular to that of the magnetic field, then the orbit will be
The displacement of a particle in string stretched in $X$ direction is represented by $y.$ Among the following expressions for $y,$ those describing wave motions are
If radius of the earth contracts $2\%$ and its mass remains the same, then weight of the body at the earth surface
If a magnet is suspended at an angle $30^o$ to the magnetic meridian, it makes an angle of $45^o$ with the horizontal. The real dip is