Download App

Electron, Photon, Photoelectric Effect and X-Rays — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectron, Photon, Photoelectric Effect and X-Rays1 Mark
MCQ
An electron is accelerated through a potential difference of $200$ volts. If $e/m$ for the electron be $1.6 \times 10^{11}$ coulomb/kg, the velocity acquired by the electron will be
  • ✓
    $8 \times 10^6\ m / s$
  • B
    $8 \times 10^5\ m / s$
  • C
    $5.9 \times 10^6\ m / s$
  • D
    $5.9 \times 10^5\ m / s$
✓

Answer

Correct option: A.
$8 \times 10^6\ m / s$
$8 \times 10^6\ m / s$

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 Electron, Photon, Photoelectric Effect and X-Rays→Electron, Photon, Photoelectric Effect and X-Rays — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

A bar magnet has coercivity $4 \times 10^3 Am^{-1}.$ It is desired to demagnetise it by inserting it inside a solenoid $12 \ cm$ long and having $60$ turns. The current that should be sent through the solenoid is
→
Which of the following electromagnetic waves have minimum frequency (a) Microwaves(b) Audible waves(c) Ultrasonic waves(d) Radiowaves
       
→
A charged particle would continue to move with a constant velocity in a region wherein:
→
In the given circuit $R$ in pure resistance and $X$ is unknown circuit element. An $AC$ voltage source is applied across $A$ and $C$. If $V_{AB}​ = V_{AC}​,$ then $X$ is.
Image
→
A proton is accelerated through $50,000 V.$ will increase Its energy by
→
A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be(a) 3.0(b) 2.0(c) 2.5(d) 1.5
       
→
A nucleus of element X is represented as $^{56}_{26}\text{X}$
Which is an isotope of element X?
→
When a soap bubble is negatively charged, its radius is:
→
Diameter of a plano$–$convex lens is $6 \ cm$ and thickness at the centre is $3 \ mm.$ If the speed of light in the material of the lens is $2 \times 10^8 m/\sec$, the focal length of the lens is
→
If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be(a) m/4(b) m/2(c) m/8(d) 4m
       
→