MCQ
Relation between the colour and the temperature of a star is given by
  • Wein’s displacement law
  • B
    Planck’s law
  • C
    Hubble’s law
  • D
    Fraunhofer diffraction law

Answer

Correct option: A.
Wein’s displacement law
a
According to Wien's displacement law, $\lambda T = constant$. For red, $\lambda$ is large so temperature is less. For blue temperature is large accordingly.

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

The dimensions of a cone are measured using a scale with a least count of $2 mm$. The diameter of the base and the height are both measured to be $20.0 cm$. The maximum percentage error in the determination of the volume is. . . . .
A tunnel is dug along the diameter of earth of mass $'M'$ and then a mass $'m'$ is released a distance $'X'$ from centre so that the time period of oscillation is $T$ . If mass $'4m'$ is released from same point then time period of oscillation will be 
The total kinetic energy of $1$ mole of oxygen at $27^{\circ} \mathrm{C}$ is :

[Use universal gas constant $(R)=8.31 \mathrm{~J} / \mathrm{mole} \mathrm{K}$ ]

A simple harmonic oscillator of angular frequency $2\,rad\,s^{-1}$ is acted upon by an external force $F = sin\,t\,N .$ If the oscillator is at rest in its equilibrium position at $t = 0,$ its position at later times is proportional to
A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then
Which of the following represents uniformly accelerated motion?
Water is filled up to a height $h$ in a beaker of radius $R$ as shown in the figure. The density of water is $\rho$, the surface tension of water is $T$ and the atmospheric pressure is $P_0$. Consider a vertical section $ABCD$ of the water column through a diameter of the beaker. The force on water on one side of this section by water on the other side of this section has magnitude
A force $\overrightarrow F = (5\hat i + 4\hat j)$ $N $ acts on a body and produces a displacement $\overrightarrow S = (6\hat i - 5\hat j + 3\hat k)$ $m$ . The work done will be......$J$
When a rubber band is stretched by a distance $x$, it exerts a restoring force $F = ax + bx^2$, where $a$ and $b$ are constants. Work done in stretching rubber band by distance $L$ from its unstretched position is
A rod of length $50\,cm$ is pivoted at one end. It is raised such that if makes an angle of $30^o$ fro the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in $rad\,s^{-1}$ ) will be $(g = 10\,ms^{-2})$