Download App

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

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter1 Mark
MCQ
Which of the following are quick electron emissions?
  • A
    Photoelectric emission
  • B
    Field emission
  • C
    Secondary emission
  • D
    Thermionic emission
✓

Answer

  1. Field emission

Explanation:

Field electron emission, or simply field emission, is known as quick electron emissions because, in this type of electron emission, the emission of electrons is induced due to the presence of an electrostatic field.

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→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

An electron and a proton enter region of uniform magnetic field in a direction at right angles to the field with the same kinetic energy. They describe circular paths of radius   and   respectively. Then

(a)  

(b)  

(c)  

(d)  may be less than or greater than   depending on the direction of the magnetic field
→
Two wires of same substance are given. Length and diameter of first wire are double that of the other. The resistance of first is __________ of other.
→
A sinusoidal voltage $\text{V}=200\sin314\text{t}$ is applied to a $10\Omega$ resistor. Find the peak voltage.
→

ABC is a right angled triangle in which AB = 3 cm  and BC = 4 cm. And Ð ABC = p/2. The three charges +15, +12  and -20 e.s.u.  are placed respectively on A, B and C. The force acting on B  is

(a) 125 dynes

(b) 35 dynes

(c) 25 dynes

(d) Zero
→
Let r be the distance of a point on the axis of a bar magnet from its centre. The magnetic field at such a point is proportional to:

  1. $\frac{1}{\text{r}}$

  2. $\frac{1}{\text{r}^2}$

  3. $\frac{1}{\text{r}^3}$

  4. None of these.

→

Two capacitors each of capacity 2 μF  are connected in parallel. This system is connected in series with a third capacitor of 12 μF  capacity. The equivalent capacity of the system will be

(a) 16 μF                                            

(b) 13 μF

(c) 4 μF   

(d) 3 μF
→

The resistances of a wire at temperatures t℃ and 0℃  are related by

(a)  

(b)  

(c)  

(d)  
→
E.M.F. ofa cell is expressed in:
→

In Young's double slit experiment, the distance between the two slits is 0.1 mm and the wavelength of light used is 4 . If the width of the fringe on the screen is 4 mm, the distance between screen and slit is

(a) 0.1 mm

(b) 1 cm

(c) 0.1 cm

(d) 1 m
→

The explosion of the atomic bomb takes place due to

(a) Nuclear fission

(b) Nuclear fusion

(c) Scattering

(d) Thermionic emission
→