Download App

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

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

When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts

(a) 0.25 Å

 (b) 0.5 Å

 (c) 1.5 Å  

 (d) 1.0 Å
✓

Answer

(a) 0.25 Å

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 [1M]" from Electron, Photon, Photoelectric Effect and X-Rays→Electron, Photon, Photoelectric Effect and X-Rays — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

The length of Milky way is

(a) 100,000 light years

(b) 10,000 light years

(c) 1000 light years

(d) 100 light years
→
When a bar magnet is broken into two pieces:
→

The energy of a hydrogen atom in its ground state is -13.6eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is

(a) – 2.72 eV

(b) – 0.85 eV

(c) – 0.54 eV

(d) – 3.4 eV
→

A conducting rod of length 2l is rotating with constant angular speed w about its perpendicular bisector. A uniform magnetic field   exists parallel to the axis of rotation. The e.m.f. induced between two ends of the rod is

(a) Bω    

(b)  Bω

(c)  Bω

(d) Zero
→

Select the correct statement

(a) In a full wave rectifier, two diodes work alternately

(b) In a full wave rectifier, two diodes work simultaneously

(c) The efficiency of full wave and half wave rectifiers is same

(d) The full wave rectifier is bi-directional.
→
A thin lens is made up of a material of refractive index $\mu=1.51$. It is dipped into the water $(\mu=1.33)$. This lens will behave :
→
Let $\overrightarrow{\text{C}}=\overrightarrow{\text{A}}+\overrightarrow{\text{B}}.$
  1. $|\overrightarrow{\text{C}}|$ is always greater than $|\overrightarrow{\text{A}}|$
  2. It is possible to have $|\overrightarrow{\text{C}}|<|\overrightarrow{\text{A}}|$ and $|\overrightarrow{\text{C}}|<|\overrightarrow{\text{B}}|$
  3. C is always equal to A + B
  4. C is never equal to A + B.
→

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit:

→
The dimensional formula of $\frac{1}{2}\in_{0}E^{2}$ is identical to :
→

In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be

(a) 0.9 V

(b) 0.5 V

(c) 0.4 V  

(d) 0.1 V
→