Download App

Universe — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsUniverse1 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
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 "M.C.Q (1 Marks)" from Universe→Universe — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The valence of the impurity atom that is to be added to germanium crystal so as to make it a N-type semiconductor, is 
→
Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment
→
In Franck-Hertz experiment, the first dip in the current-voltage graph for hydrogen is observed at $10.2 \mathrm{~V}$. The wavelength of light emitted by hydrogen atom when excited to the first excitation level is $\qquad$ $\mathrm{nm}$.

$\left(\right.$ Given $\mathrm{hc}=1245 \mathrm{eV} \mathrm{nm}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$ ).

→
If the energy of a photon corresponding to a wavelength of 6000 Å is $3.32 \times 10^{-19} \mathrm{J}$, the photon energy for a wavelength of 4000 Å will be
→
An electron in an excited state of $Li ^{2+}$ ion has angular momentum $3 h / 2 \pi$. The de Broglie wavelength of the electron in this state is $p \pi a_0$ (where $a_0$ is the Bohr radius). The value of $p$ is
→
An electron is projected with velocity $v_0$ in a uniform electric field $E$ perpendicular to the field. Again it is projetced with velocity $v_0$ perpendicular to a uniform magnetic field $B/$ If $r_1$ is initial radius of curvature just after entering in the electric field and $r_2$ is initial radius of curvature just after entering in magnetic field then the ratio $r_1:r_2$ is equal to 
→
In a hypothetical fission reaction

${ }_{92} \mathrm{X}^{236} \rightarrow{ }_{56} \mathrm{Y}^{141}+{ }_{36} \mathrm{Z}^{92}+3 \mathrm{R}$

The identity of emitted particles $(R)$ is :

→
One milliwatt of light of wavelength $4560\ Å$ is incident on a cesium surface of work function $1.9\  eV$. Given that quantum efficiency of photoelectric emission is $0.5\%$. Planck's constant $h = 6.62 × 10^{-34}\  J-s$, velocity of light $= 3 × 10^8\  ms^{-1}$, the corresponding photo electric current is
→
The bending of beam of light around corners of obstacles is called
→
Two positively charged spheres of masses $m_1$ and $m_2$ are suspended from a common point at the ceiling by identical insulating massless strings of length $l$. Charges on the two spheres are $q_1$ and $q_2$, respectively. At equilibrium, both strings make the same angle $\theta$ with the vertical. Then
→