MCQ
Two stars emit maximum radiation at wavelength $3600 \mathring {A}$ and $4800 \mathring A$ respectively. The ratio of their temperatures is
- A$1: 2$
- B$3: 4$
- ✓$4: 3$
- D$2: 1$
✓
Answer
Correct option: C.
$4: 3$
$\frac{T_1}{T_2}=\frac{\lambda_{m_2}}{\lambda_{m_1}}=\frac{4800}{3600}\Rightarrow\frac{48}{36}=\frac{4}{3}$
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
In a compound microscope magnification will be large, if the focal length of the eye piece is
The period of a satellite in a circular orbit of radius $R$ is $T$, the period of another satellite in a circular orbit of radius $4 R$ is
→The transfer ratio of a transistor is $50.$ The input resistance of the transistor when used in the common-emitter configuration is $1 k \Omega$. The peak value for an A.C input voltage of $0.01 V$ peak is
→Towards the centre of sun
The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here $A=$ area of the coil, $B=$ magnetic field)
→Four particles each of mass $\mathcal{M}$, are located at the vertices of a square with side $L$. The gravitational potential due to this at the centre of the square is
→In the figure magnetic energy stored in the coil is
Using a bar magnet $P$, a vibration magnetometer has time period 2seconds. When a bar $Q$ (identical to $P$ in mass and size) is placed on top of $P$, the time period is unchanged. Which of the following statements is true
→What average horsepower is developed by an $80 \mathrm{~kg}$ man while climbing in $10 s$ a flight of stairs that rises $6 \mathrm{~m}$ vertically
→The frequency of oscillation of the springs shown in the figure will be
