Download App

DUAL NATURE OF RADIATION AND MATTER — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsDUAL NATURE OF RADIATION AND MATTER2 Marks
Question
Explain the photoelectric effect when the radiation is incident on different metals?
✓

Answer

→Metals like Zinc $( Zn )$, Cadmium (Cd) Magnesium ( Mg ) get a photoelectric effect by incidenting ultraviolet light of sufficient frequency on them.
→Some alkali metals such as Lithium (Li), Sodium (Na), Potassium (K), Cesium (Cs) and Rubidium (Rb) exhibit a photoelectric effect when exposed to visible light. These metals are called light sensitive (photosensitive) metals.

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 "2 Marks Questions" from DUAL NATURE OF RADIATION AND MATTER→DUAL NATURE OF RADIATION AND MATTER — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

If we put a cardboard (say 20cm × 20cm) between a light source and our eyes, we can't see the light. But when we put the same cardboard between a sound source and our ear, we hear the sound almost clearly. Explain.
→
A man of mass $50\ kg$ starts moving on the earth and acquires a speed of $1.8\ m/s.$ With what speed does the earth recoil? Mass of earth $= 6 \times 10^{24}kg.$
→
Poynting vectors $\vec{S}$ is defined as a vector whose magnitude is equal to the wave intensity and whose direction is along the direction of wave propogation. Mathematically, it is given by $\vec{S}=\frac{1}{\mu_0} \vec{E} \times \vec{B}$. Show the nature of $S$ vs $t$ graph.
→
Obtain expression for energy required to establish electric current I in a coil having self inductance L.
###
Obtain expression $U_B=\frac{1}{2} L I ^2$ for magnetic energy stored while establishing current I in coil having self inductance L.
→
What is the average value of ac voltage
$\text{V = V}_0\sin\omega\text{t}$
Over the time interval t = 0 to $\text{t}=\frac{\pi}{\omega}.$
→
A circular road of radius 50m has the angle of banking equal to 30°. At what speed should a vehicle go on this road so that the friction is not used?
→
The ground state energy of hydrogen atom is – 13·6 eV. If an electron makes a transition from an energy level – 1·51 eV to – 3·4 eV, calculate the wavelength of the spectral line emitted and name the series of hydrogen spectrum to which it belongs.
→
Find the electric potential energy of a system made up of three point charges.
→
Define electric field intensity and equipotential surface in current carrying conductor.
→
While gas from a cooking gas cylinder is used, the pressure does not fall appreciably till the last few minutes. Why?
→