Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 85

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Weekly Quiz Competition

Question 1
4 / -1

A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then

A
N ∝ L and E ∝ L

B
N ∝ L and E ∝ 1/λ

C
N ∝ λ and E ∝ L

D
N ∝ 1/λ and E ∝ 1/L

Solution
Question 2
4 / -1

The threshold frequency for certain metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 x 10¹⁴ Hz isincident on the metal, the cut-off voltage of the photoelectric current will be

A
4.9 V

B
3.0 V

C
2.0 V

D
1.0 V

Solution
Question 3
4 / -1

The photoelectric threshold wavelength of a certain metal is 3000 Å. If the radiation of 2000 Å is incident on the metal

A
Electrons will be emitted

B
Positrons will be emitted

C
Protons will be emitted

D
Electrons will not be emitted

Solution
Question 4
4 / -1

A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

A
2 eV

B
2 J

C
2 kJ

D
2 keV

Solution
Question 5
4 / -1

The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 4000 Å light?

A
Copper

B
Sodium

C
Both

D
Neither of them

Solution
Question 6
4 / -1

For intensity I of a light of wavelength 5000 Åthe photoelectron saturation current is 0.40 µA and stopping potential is 1.36 V, the work function of metal is

A
2.47 eV

B
1.36 eV

C
1.10 eV

D
0.43 eV

Solution
Question 7
4 / -1

The work function of aluminum is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminum, then emission of electrons will be

A
Possible

B
Not possible

C
Data is incomplete

D
Depends upon the density of the surface
Question 8
4 / -1

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

A
Double

B
Half

C
Four times

D
No change
Question 9
4 / -1

In photoelectric effect, the electrons are ejected from metals if the incident light has certain minimum

A
Wavelength

B
Frequency

C
Amplitude

D
Angle of incidence
Question 10
4 / -1

When photons of energy hv for on an aluminum plate (of work function = E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy ofthe ejected photoelectrons will be

A
K

B
K + hv

C
K + E₀

D
2K

Solution