Dawn Of Modern Physics Set 3

Results

#1. The minimum energy needed for a photon to create an electron-positron pair is

1.02 KeV

0.51 KeV

0.51 MeV

1.02 MeV

#2. Davison and Germer indicates in their experiment

Electron refraction

Electron polarization

Electron reflection

Electron diffraction

#3. Photon with energy greater than 1.02 MeV can interact with matter as

Photoelectric effect

Compton effect

Pair production

Pair annihilation

#4. Stopping potential for a metal surface in case of photo electric emission depends on

The threshold frequency for the metal surface

The intensity of incident light

The frequency of incident light and the work function for metal surface

None of these

#5. As the temperature of black body is raised, the wavelength corresponding to maximum intensity

Shifts towards longer wavelength

Remains the same

Shifts towards shorter wavelength

Shifts towards shorter as well as longer wavelength

#6. The name of photon for quantum of light was proposed by

Ampere

Planck's

Thomson

Einstein

#7. A photon is a

Unit of energy

Positively charged particle

Packet of electromagnetic radiations

Unit of wavelength

#8. In Davison-Germer experiment, the diffracted proton from crystal shows

Particle property

Wave property

Light property

Quantum property

#9. In electron microscope, electric and magnetic field are used as

Electromagnetic gun

Source of electromagnetic waves

Deflected charged particle

Converging source of electrons

#10. The uncertainty in momentum and position is due to its

Property of matter and radiation

Two dimensional motions

Emotion of certain wave length

Very high velocity

Finish