Question
Star A emits green coloured light and star B blue coloured. Among the two temperature of which are is more?
✓
Answer
According to Wien's displacement law
$\begin{array}{l}\lambda_{ m } T =\text { constant } \\ \text { and } T \propto \frac{1}{\lambda_{ m }}\end{array}$
Since the wavelength of blue colour is less than of green colour, so the temperature of the star emitting blue light will be more i.e. the temperature of star B would be more than that of star A.
$\begin{array}{l}\lambda_{ m } T =\text { constant } \\ \text { and } T \propto \frac{1}{\lambda_{ m }}\end{array}$
Since the wavelength of blue colour is less than of green colour, so the temperature of the star emitting blue light will be more i.e. the temperature of star B would be more than that of star A.
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
Show that the dimensions of the displacement current $\in_0\frac{\text{d}\phi_\text{E}}{\text{dt}}$ are that of an electric current.
→In a standing wave pattern in a vibrating air column, nodes are formed at a distance of 4.0cm. If the speed of sound in air is 328m/s, what is the frequency of 73 the source?
The mass of a person is 30 kg and the area of the sole of his foot is $0.01 m^2$. If $g =10 m /$ $s^2$ then calculate the pressure exerted by the person on the floor.
(i) When the person is standing on one leg.
(ii) When the person is standing on both legs.
→(i) When the person is standing on one leg.
(ii) When the person is standing on both legs.
What is the acceleration due to gravity on the top of Mount Everest? Mount Everest is the highest mountain peak of the world at the height of 8848m. The value at sea level is $9.80 \mathrm{~m} / \mathrm{s}^2$.
→Find the binding energy of a hydrogen atom in the state n = 2.
Calculate the current through the circuit and the potential difference across the diode shown in figure. The drift current for the diode is $20\mu\text{A}.$
→Which of the following functions of time represent $(a)$ simple harmonic motion and $(b)$ periodic but not simple harmonic? Give the period for each case.
$(1) \sin \omega t-\cos \omega t$
$(2) \sin ^2 \omega t$
→$(1) \sin \omega t-\cos \omega t$
$(2) \sin ^2 \omega t$
If two vectors of equal magnitude add to either of them by magnitude, what is the angle between them?
A block of mass m is attached to two unstretched springs of spring constants $k_1$ and $k_2$ as shown in figure. The block is displaced towards right through a distance x and is released. Find the speed of the block as it passes through the mean position shown.
→Although velocity of air molecules is very fast but fragnance of a perfume spreads at a much slower rate, explain?