For normal adjustment, length of astronomical telescope is______________?

A. Fo + fe
B. Fo – fe
C. Fo / fe
D. Fe / fo

A photon of wavelength 900nm behaves like a particle of mass______________?

A. 5.53 x 10-36kg
B. 0 kg.
C. 2.46 x 10-36kg
D. 1.84 x 10-44kg

The velocity of a particle of mass m of de-Broglie wavelength λ is______________?

A. V = 3 ×× 106 ms-1
B. V = 2 ×× 10 ms-1
C. V = 2 ×× 6 ms-1
D. V = 2 ×× 106 ms-1

In Davisson-Germer experiment the diffracted proton from crystal shows______________?

A. Particle property
B. Wave property
C. Light property
D. Quantum property

If a diffraction grating is placed in the path of a light beam it reveals______________?

A. Wave property
B. Particle property
C. Energy particle
D. Electromagnetic wave property

In an electron microscope, we use energetic particles because of______________?

A. Penetrating power is high
B. Kinetic energy is large
C. Wavelength is very short
D. All the above reasons

In the electron microscope, electric & magnetic fields are used as_______________?

A. Electromagnetic gun
B. Source of electromagnetic waves
C. Deflecting charged particle
D. Converging source of electrons

A three-dimensional image is obtained by________________?

A. Electron microscope
B. Scanning electron microscope
C. Magnetic imaging
D. None of the above

The uncertainty in momentum & position is due to its_____________?

A. Property of matter and radiation
B. Two-dimensional motion
C. Emission of the certain wavelength
D. Very high velocity

For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?

A. 107m/sec
B. Should be greater than the speed of light.
C. Be zero
D. Not be wave-like