16th Nov Dual Nature of Radiation and Matter Quiz 3 – Punjab Meritorious School Preparation Portal

Welcome to your 16th Nov Dual nature of Radiation and Matter Quiz 3 CBT TEST

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A 200 W sodium street lamp emits yellow light of wavelength 0.6 µm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be

1:4

1:2

1:1

1:5

The threshold frequency for a photosensitive metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 × 10¹⁴ Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly

The momentum of a photon of energy hν will be

A source S₁ is producing. 10¹⁵photons per second of wavelength 5000 Å. Another source S₁ is producing 1.02×10¹⁵photons per second of wavelength 5100 Å Then, (power of S₂) (power of S₁) is equal to:

1.00

1.02

1.04

0.98

Photoelectric emmision occurs only when the incident light has more than a certain minimum

power

wavelength

intensity

frequency

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the materials is:

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

1.8V

1.2V

0.5V

2.3 V

Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:

1:4

1:2

1:1

1:5

A source of light is placed at a distance of 50 cm from photocell and the stopping potential is found to be V₀ If the distance between the light source and photocell is made 25 cm, the new stopping potential will be

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