Second Year Physics Chapter 19 Online MCQ Test for 2nd Year Physics Chapter 19 Dawn of Modern Physics Preparation

The value of Stefan is constant is:

• 4.57 x 10^-8 m²k² A
• 5.67 x10^-8 wm^-2k^-4 B
• 6.67x 10^-11 wm²k⁴ C
• 7.45 x  10^-9 m² wk³ D

• Wien's constant A
• Planck's constant B
• Davison constant C
• Lumber's constant D

All motions are

• Absolute A
• Uniform B
• Relative C
• Variable D

When the K.E. of photoelectric is zero, the frequency of incident photon is.

• Less than A
• greater than B
• Equal to C
• Much greater D

Albert Einstein got noble prize in:

• 1926 A
• 1921 B
• 1918 C
• 1931 D

The energy of photon is givne by

• mv2/2 A
• hf B
• Va e C
• mac¹ D

Who explained the photo electric effect.

• Max Plank A
• Einstein B
• Henry C
• Rutherford D

Which is the most refined form of matter.

• Smoke A
• Fog B
• Light C
• Electron D

Photo electrons are emitted y using visible light when the metal is.

• sodium A
• Copper B
• Nicked C
• Cobalt D

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

• K.E of al the emited electrons A
• Mean K.E of emited electrons B
• Maximum K.E of emited electrons C
• Minimum K.E of emited electrons D

Photodiode is used for wave nature of.

• Light A
• Thermal radiation B
• Radi waves C
• Sound waves D

unit of Plank's constant is same as that of.

• Acceleration A
• Angular momentum B
• Linear momentum C
• Entropy D

The number of electrons emitted depends upon

• Colour of target surface A
• Shape of surface B
• Frequency of incident light C
• Intensity of incident light D

Maximum Compton shift is observed at.

• 30^oC A
• 90^oC B
• 45^oC C
• 180^oC D

The special theory of relativity based on.

• One postulate A
• Two postulates B
• Three postulates C
• Four postulates D

The value of Wien's constant:

• 2.9x10^-3mk A
• 2.19x10^-7mk B
• 3.18 x10⁶ km^-1 C
• 6.21 x 10^-9m²wk³ D

In the equation if f₂ > then

• 
  A
• 
  B
• 
  C
• 
  D