Download App

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

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectron, Photon, Photoelectric Effect and X-Rays1 Mark
Question

An electron is accelerated through a potential difference of 200 volts. If e/m for the electron be 1.6   coulomb/kg, the velocity acquired by the electron will be

(a) 8  

(b) 8 

(c) 5.9  

(d) 5.9  
✓

Answer

(a) 8  

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

Similar questions

A constant current i is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the soleniod along axis?
  1. Magnetic field at the centre.
  2. Mangetic flux linked with the solenoid.
  3. Self-inductance of the solenoid.
  4. Rate of Joule heating.
→

If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is

(a) Stationary

(b) Moving towards earth

(c) Moving away from earth

(d) Information is incomplete
→
Two uniform solid spheres having unequal masses and unequal radii are released from rest from the same height on a rough incline. If the spheres roll without slipping:
  1. The heavier sphere reaches the bottom first.
  2. The bigger sphere reaches the bottom first.
  3. The two spheres reach the bottom together.
  4. The information given is not sufficient to tell which sphere will reach the bottom first.
→
The inherent property of all materials is:
→
In a cathode ray tube, the screen is coated with fluorescent material:
→

In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is

(a) 0o

(b) 45o

(c) 90o

(d) 180o
→

The spectrum of radiation 1.0   is in the infrared region. The energy of one photon of this in joules will be

(a) 6.62  

(b) 6.62  

(c)  

(d) 3  

→

In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

(a) 1.944 r

(b) 0.973 r

(c) 0.486 r

(d) 0.243 r
→
Take the effect of bulging of earth and its rotation in account. Consider the following statements:
  1. There are points outside the earth where the value of g is equal to its value at the equator.
  2. There are points outside the earth where the value of g is equal to its value at the poles.
  1. Both A and B are correct.
  2. A is correct but B is wrong.
  3. B is correct but A is wrong.
  4. Both A and B are wrong.
→

Two electric bulbs, one of 200 volt 40 watt and the other 200 volt 100 watt are connected in a house wiring circuit

(a) They have equal currents through them

(b) The resistance of the filaments in both the bulbs is same

(c) The resistance of the filament in 40 watt bulb is more than the resistance in 100 watt bulb

(d) The resistance of the filament in 100 watt bulb is more than the resistance in 40 watt bulb
→