Download App

Universe — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsUniverse1 Mark
MCQ
The sun emits a light with maximum wavelength $510\ mm$ while another star $X$ emits a light with maximum wavelength of $350\  nm$. What is the ratio of surface temperature of sun and the star $X$
  • A
    $2.1$
  • ✓
    $0.68$
  • C
    $0.46$
  • D
    $1.45$
✓

Answer

Correct option: B.
$0.68$
As $\lambda \propto \frac{1}{T}$; so $\frac{T_1}{T_2}=\frac{\lambda_2}{\lambda_1}=\frac{350}{510}=0.68$

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

Explore more

More "MCQ" from Universe→Universe — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point $2 \mathrm{~m}$ away from the bulb is $5 \times 10^{-4}$ phot (lumen/ $\mathrm{cm}$ ). The line joining the bulb to the point makes an angle of 60 with the normal to the surface. The intensity of the bulb in candela is
→
A diver at a depth of $12 \mathrm{~m}$ in water $(\mu=4 / 3)$ sees the sky in a cone of semi-vertical angle
→
An aeroplane is flying with a uniform speed of $100 m / s$ along a circular path of radius $100 m$. the angular speed of the aeroplane will be
→
If the temperature of a hot body is increased by $50 \%$ then the increase in the quantity of emitted heat radiation will be
→
The electrons are emitted in the photoelectric effect from a metal surface
→
Frequency of a wave is $6 \times 10^{15}\ Hz$. The wave is
→
Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time
→
If the amplification factor of a triode $(\mu)$ is 22 and its plate resistance is $6600 ohm$, then the mutual conductance of this valve is mho is
→
A manometer connected to a closed tap reads $3.5 \times 10 N / m$. When the valve is opened, the reading of manometer falls to $3.0 \times 10 N / m$, then velocity of flow of water is
→
Water rises against gravity in a capillary tube when its one end is dipped into water because
→