Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 61

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Weekly Quiz Competition

Question 1
4 / -1

Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only

A
A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of - 0.155 A

B
A continuous X-ray spectrum (Bremsstrahlung) with all wavelengths

C
The characteristic X-rays spectrum of tungsten

D
A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of - 0.155 A and the characteristic X-ray spectrum of tungsten

Solution
Question 2
4 / -1

The X-ray wavelength of L_α line of platinum (Z = 78) is 1.30 Å. The X-ray wavelength of L_α line of Molybdenum (Z = 42) is

A
5.41 Å

B
4.20 Å

C
2.70 Å

D
1.35 Å

Solution
Question 3
4 / -1

The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27°C and 127°C respectively is

A

B

C

D
1

Solution
Question 4
4 / -1

A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some time during which a total energy of 1 × 10^–7 J falls on the surface. Assuming on an average one out of 10³ photons incident is able to eject electron, the potential on sphere will be

A
1 V

B
2 V

C
3 V

D
Zero

Solution
Question 5
4 / -1

A photon of wavelength 6630 Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to

A
6.63 × 10^–27 kg-m/s

B
2 ×10^–27 kg-m/s

C
10^–27 kg-m/s

D
None of these

Solution
Question 6
4 / -1

The ratio of de-Broglie wavelength of a α-particle to that of a proton being subjected to the same magnetic field so that the radii of their path are equal to each other assuming the field induction vector ( B ) ⃗ is perpendicular to the velocity vectors of the α-particle and the proton is

A
1

B
1/4

C
1/2

D
2

Solution
Question 7
4 / -1

K_α wavelength emitted by an atom of atomic number Z = 11 is λ. Find the atomic number of an atom that emits K_α radiation with wavelength 4λ

A
Z = 6

B
Z = 4

C
Z = 11

D
Z = 44

Solution
Question 8
4 / -1

A
2

B
1

C

D

Solution
Question 9
4 / -1

Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be

A
0.28 MeV

B
0.34 MeV

C
0.39 MeV

D
0.46 MeV

Solution
Question 10
4 / -1

A proton, a deutron and an α-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is

A
1 : 2 : 8

B
1 : 2 : 4

C
1: 1 : 2

D
None of these

Solution