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

Fill the Details mentioned below and Attempt the Test.

Name

School Name with City

Phone Number

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

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

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

The momentum of a photon of energy hν will be

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

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

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

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:

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

Please fill in the comment box below.

Time is Up!

Time's up