Particle Nature of radiation

The threshold frequency of potassium is 3x 1014 Hz. The work function is

• 1.0 x10-19 J
• 2.0x10-19 J
• 4.0x10-19 J
• 0.5 x 10-19 J

The work function of a metal is metal is 3.3 x10-19 J. The maximum wavelength of the photons required to eject electron from the metal is

• 200 nm
• 300 nm
• 400 nm
• 600 nm

The threshold wavelength of a metal surface is 600 nm. The wavelength of the incident light is 450 nm. The maximum kinetic energy of the incident photons will be nearest to

• 0.3 eV
• 0.6 eV
• 0.9 eV
• 1.2 eV

The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV. What is the stopping potential?

• 5 V
• 10 V
• 15 V
• 30 V

The light photons of energy 1.5 eV and 2.5eV are incident on a metallic surface of work function 0.5 eV. What is the ratio of the maximum kinetic energy of the photoelectrons ?

• ¼
• ½
• 2
• 4

If the threshold frequency be 2x1014 Hz, what is the work function ?

• 1.6 x10-19 J
• 3.2 x10-19 J
• 6.6 x 10-20 J
• 13.2 x 10-20 J

Light of wavelength 4000 A is incident on a metal of work function 3.2 x10-19 J . What is the maximum kinetic energy of the emitted electrons ?

• 0.75x 10-19 J
• 1.1 x 10-19 J
• 1.75 x 10-19 J
• 2.2 x 10-19 J

In an experiment photoelectrons are emitted when light of wavelength 4000 A is incident on it. They can be stopped by a retarding potential of 2 V. If the wavelength of the incident light be 3000 A, the stopping potential will be

• 1 V
• 1.5 V
• 2 V
• 3 V

A photon of 6 eV is incident on a metal surface and the emitted electrons is stopped by a retarding potential of -5 eV. What is the work function of the metal ?

• 1 eV
• 2.5 eV
• 3 eV
• 11 eV

The work function of metal –I and metal –II are 5 eV and 2.5 eV respectively. If the threshold wavelength of metal –I be 6000 A, then that for metal – II will be

• 3000 A
• 9000 A
• 12000 A
• 15000 A