Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 11

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Weekly Quiz Competition

Question 1
4 / -1

For an electron, in the second orbit of Bohr's hydrogen atom, the moment of linear momentum is

A
πh

B
2πh

C

D
Question 2
4 / -1

Sharp peak point A represents

A
characteristic X–rays

B
continuous X–rays

C
Bremsstrahlung

D
discontinuous spectrum
Question 3
4 / -1

X–rays of wavelength 0.140 nm are scattered from a block of carbon. What will be the wavelengths of X–rays scattered at 90° ?

A
0.140 nm

B
0.142 nm

C
0.144 nm

D
0.146 nm
Question 4
4 / -1

An X-ray tube produces a continuous spectrum of radiation with its shortest wavelength of 45 × 10^-2 Å. The maximum energy of a photon in the radiation in eV is (h = 6.62 × 10^-34 J-s, c = 3 × 10⁸ ms^-1 )

A
27500

B
22500

C
17500

D
12500

Solution
Question 5
4 / -1

K_α and K_β , X-rays are emitted when there is a transition of electron between the levels

A
n = 2 to n =1 and n = 3 to n = 1 respectively

B
n = 2 to n =1 and n = 3 to n = 2 respectively

C
n = 3 to n = 2 and n = 4 to n = 2 respectively

D
n = 3 to n = 2 and n = 4 to n = 3 respectively
Question 6
4 / -1

When two different materials A and B having atomic number Z₁ and Z₂ are used as the target in Coolidge γ-ray tube at different operating voltage V₁and V₂ respectively their spectrums are found as below.

A
V₁ > V₂ and Z₂ > Z₁

B
V₁ < V₂ and Z₁ < Z₂

C
V₁ < V₂ and Z₁ > Z₂

D
V₁ > V₂ and Z₁ < Z₂
Question 7
4 / -1

Hard X–rays for the study of fractures in bones should have a minimum wavelength of 10^-11 m. The accelerating voltage for electrons in X–rays machine should be

A
< 124 kV

B
> 124 kV

C
between 60 kV and 70 kV

D
=100 kV
Question 8
4 / -1

A beam of 35.0 keV electrons strikes a molybdenum target, generating the X–rays. What is the cut–off wavelength?

A
35.5 pm

B
40.0 pm

C
15.95 pm

D
18.2 pm
Question 9
4 / -1

An X–rays machine is operated at 40 kV. The short wavelength limit of continuous X-rays will be (h = 6.63×10^-34J–s, c = 3×10⁸ms^-1, e = 1.6×10^-19 C)

A
0.31 Å

B
0.62 Å

C
0.155 Å

D
0.62 Å

Solution
Question 10
4 / -1

Energy of characteristic X–rays is a consequence of

A
energy of projectile electron

B
thermal energy of target

C
transition in target atoms

D
None of the above