Download App

Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter1 Mark
Question
In the photoeletric effect, electrons are emitted:
✓

Answer

  1. Only if the frequency of the incident radiations is above a certain threshold value.

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 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

Magnetic permeability is maximum for(a) Diamagnetic substance(b) Paramagnetic substance(c) Ferromagnetic substance(d) All of these
   
   
→
The de$-$Broglie wavelength of a particle accelerated with $150$ volt potential is $10^{-10} m.$ If it is accelerated by $600$ volts $p.d.,$ its wavelength will be
→
In a region of constant electric field, the field lines are _______.
→
The resistivity of a wire varies with:
→
The hysteresis cycle for the material of permanent magnet is:
→
The transfer ratio of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 KW. The peak value for an A.C input voltage of 0.01 V peak is(a) 100 mA(b) 0.01 mA(c) 0.25 mA(d) 500 mA
       
→
The magnitude of the electric field due to a point charge object at a distance of 4.0 m is $9 N / C$. From the same charged object the electric field of magnitude, $16 \frac{N}{ C }$ will be at a distance of
→
Electric bulb $50\ W-100\ V$ glowing at full power are to be used in parallel with battery $120\ V, 10\ \Omega.$ Maximum number of bulbs that can be connected so that they glow in full power is
→
The area of the plates of a parallel plate condenser is $A$ and the distance between the plates is $10\ mm$. There are two dielectric sheets in it, one of dielectric constant $10$ and thickness $6\ mm$ and the other of dielectric constant $5$ and thickness $4\ mm$. The capacity of the condenser is
→
A coil has an inductance of 0.7 H and is joined in series with a resistance of $220\Omega$ When an alternating emf of 220V at 50 cps is applied to it, then the wattless component of the current in the circuit is $(\text{take }0.7\pi=2.2)$
→