Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 107

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Weekly Quiz Competition

Question 1
4 / -1

An X – ray tube is operating at 15 kv. The lower limit of the wavelength of X – rays produced is

A

B

C

D

Solution
Question 2
4 / -1

Light of wavelength 5000Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be

A
0.58 eV

B
2.48 eV

C
1.24 eV

D
1.16 eV

Solution
Question 3
4 / -1

Two radiations containing photons of energy twice and five times the work function of a metal are incident successively on the metal surface. The ratio of the maximum velocities of the emitted electrons in the two cases will be

A
1:3

B
1:4

C
1:2

D
1:1

Solution
Question 4
4 / -1

Electron with energy 80 ke V are incident on the tungsten target of an X – ray tube. K shell electrons of tungsten have –72.5 Ke V energy .X –rays emitted by the tube contain only

A
a continuously X – rays spectrum (Bremsstrahlung) with a minimum wavelength of 0.155Å

B
a continuous X – ray spectrum (Bremsstrahlung) with all wavelengths

C
the characteristic X – ray spectrum of tunsten

D
a continuously X – ray spectrum (Bremsstrahlung) with a minimum wavelength of o tunsten 0.155Å and the characteristic X – ray spectrum of

Solution
Question 5
4 / -1

An ionised gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the +x direction and a magnetic field along the +z direction, then

A
positive ions deflect towards + y direction and negative ions deflect towards –y direction

B
all ions deflect towards + y direction

C
all ions deflect towards –y direction

D
positive ions deflect towards –y direction and negative ions towards +y direction

Solution
Question 6
4 / -1

Find the kinetic energy of the photoelectrons emitted when light of wavelength 4000Å is incident on a metal of work function 2eV (find approximately)

A
0.5eV

B
1.1 eV

C
2.5 eV

D
3 eV

Solution
Question 7
4 / -1

If the potential difference applied across X – ray tube is V volt, then approximately minimum wavelength of the emitted X – rays will be

A

B

C

D

Solution
Question 8
4 / -1

A proton and an alpha particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an alpha particle is

A

B
2

C

D

Solution
Question 9
4 / -1

Two identical photo – cathodes receive light of frequencies f₁ and f₂. If the velocities of the photoelectrons ( of mass m) coming out are respectively v₁ and v₂,then.

A

B

C

D

Solution
Question 10
4 / -1

An X – ray tube is operated at a constant potential difference and it is required to get X – rays of wavelength not less than 0.2 nano-meter. Then the potential difference in kilo volt is (h = 6.63 × 10^–34 Js ; e = 1.6 × 10^-19 C, c = 3 × 10⁸ m/s)

A
24.8

B
12.4

C
6.2

D
3.1

Solution