APPLIED PHYSICS (UNIT-1 & UNIT-2)

1. Matter waves are first experimentally verified by

• De-broglie

• Schrodinger

• Davisson & Germer

2. The wavelength associated with an electron accelerated by a potential 1600 V is

• 1.2 A⁰

• 12.26 A⁰

• 3.06 A⁰

• 0.306 A⁰

3. The Minimum amount of energy required for photoelectric emission to start is called

• Threshold frequency

• Work Function

• Photoelectric effect

4. If the momentum of a particle is doubled, then the debroglie wavelength will be

• Half of original wavelength

• Double the original wavelength

• Four times the original wavelength

• No change in wavelength

5. Davisson and Germer experiment relates to

• Interference

• Diffraction

• Polarization

6. The wavelength of matter wave is independent of

• Mass

• Velocity

• Momenum

• Charge

Energy possessed by a particle in the first exicted state is

• h²/8mL²

• h²/4mL²

• 4h²/8mL

• h²/4mL²

8. Dual nature of matter wave is predicted by

• Phenomenon of Photoelectric effect

• Concept of Schrodinger Wave function

• Electron Diffraction

9. Velocity of light waves is -------------- velocity of matter waves

• Smaller than

• Greater than

• Equal to

10. At T=0K Fermi level in intrinsic semiconductor is

• E_F = (E_c + E_v )/2

• E_F = (E_a + E_v )/2

• E_F = (E_a + E_d )/2

• E_F = (E_c + E_d )/2