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
Light of wavelength $\lambda$ falls on a metal having work function $\frac{\text{h}_\text{c}}{\lambda_0}.$ Photoelectric effect will take place only if:
✓

Answer

  1. $\lambda\leq\lambda_0$
Explanation:
As the work-function of the metal is $\frac{\text{hc}}{\lambda_0}$, its threshold wavelength is $\lambda_0.$
For photoelectric effect, the wavelength of the incident light should be less than or equal to the threshold wavelength of the metal on which light is incident.

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

A cell of $e.m.f. E$ is connected with an external resistance $R$, then $p.d.$ across cell is $V$. The internal resistance of cell will be
→
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20℃  ? The temperature of boiling water is 100℃(a) 6.4 minutes(b) 6.3 minutes(c) 12.6 minutes(d) 12.8 minutes
       
→
The contribution in the total current flowing through a semiconductor due to electrons and holes are $\frac{3}{4}$  and $\frac{1}{4}$  respectively. If the drift velocity of electrons is $\frac{5}{2}$  times that of holes at this temperature, then the ratio of concentration of electrons and holes is
→
The ionisation potential of hydrogen atom is 13.6 volt. The energy required to remove an electron in the n = 2 state of the hydrogen atom is(a) 27.2 eV(b) 13.6 eV(c) 6.8 eV                                          (d) 3.4 eV
       
→
What is produced by induction coil ?
→
Which group among the following is insulator?
→
The phenomena involved in the reflection of radiowaves by ionosphere is similar to:
→
The graph between wave number $(\overline{\mathrm{v}})$ and angular frequency $(\omega)$ is
→
If aperture of lens is halved then image will be(a) No effect on size  (b) Intensity of image decreases(c) Both (a) and (b) (d) None of these
   
   
→
If a 30 V, 90 W bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb (a) 10 ohm(b) 20 ohm(c) 30 ohm(d) 40 ohm
       
→