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Chapter 19 - Dawn of ModernMhysics - 4
1.
The compton effect confirms:
a) Wave nature of light
b) Particle nature of light
c) Dual nature of light
d) All
2.
The existence of positron was discovered in the :
a) Cosmic radiation
b) Electromagnetic radiation
c) Thermal radiation
d) Non-electromagnetic radiation.
3.
De. Broglie wavelength of a particle can be expressed by;
a) λ=h/p
b) λ=h/f
c) Λ=p/h
d) Λ=t/h
4.
In Davisson and Germer experiment target crystal is made up of:
a) Copper
b) Lead
c) Nickel
d) Glass
5.
The screen used in electron microscope is made of:
a) Florescent material
b) Absorbing material
c) Transparent material
d) Reflecting material
6.
Mass-Energy relation given by Einstein is represented as:
a) E=hf
b) E=m2c
c) E=mc2
d) E=mv2
7.
Uncertainty principle was first proposed by:
a) Heisenberg
b) Plank
c) Einstein
d) Thomson
8.
Using Heisenberg uncertainty principle it can be proved that:
a) There is always uncertainty in measuring accurate energy and momentum for atomic particle
b) Light have dual nature
c) Electron lies out of the nucleus
d) Light has particle nature only
9.
If alpha particle, electron, proton and neutron, all having same energy which one will have the shortest wavelength:
a) Electron
b) Alpha particle
c) Proton
d) Neutron
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