12th Class Physics MCQS Chapter 8

The photoelectric effect predicts that light is made of

None of these

Neutrons

Protons

Photons

De-Broglie waves are associated with

All parties whether in motion or at rest

Moving charged particles only

Moving neutral particles only

All moving particles

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

Minimum K.E of emited electrons

Mean K.E of emited electrons

K.E of al the emited electrons

Maximum K.E of emited electrons

The uncertainty principle was given by

Heisenberg

De-Broglie

Einstein

Max Planck

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

Compton effect

Pair production

Photoelectric effect

Annihilation of matter

Compton shift is maximum for scattering angle of photon

45^o

0^o

90^o

180^o

A block body is an ideal:

Absorber

Both a & b

None of above

Radiator

Which one of the following paved the way for modern physics

Newtonian mechanics

All of above

Quantum theory

Theory of relativity

The value of Wien’s constant:

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

2.9×10^-3mk

2.19×10^-7mk

Max planck received noble prize in:

1927

1932

1914

1918