Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 97

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Weekly Quiz Competition

Question 1
4 / -1

An X-ray pulse of wavelength 4.9 Å is sent through a section of Wilson cloud chamber containing a super saturated gas, and tracks of photo electron ejected from the gaseous atoms are observed. Two groups of tracks of 1.40 cm and 2.02 cm are noted. If the range-energy relation for cloud chamber is given by R = αE with α =1 cm/keV, obtain the binding energies of the two levels from which electrons are emitted. Given h = 6.63 × 10^–34 J-s, e = 1.6 × 10^–19 J.

A
0.52 KeV

B
0.75 eV

C
0.52 eV

D
0.75 keV

Solution
Question 2
4 / -1

The largest distance between the interatomic planes of a crystal is 10^–7 cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

A
1 Å

B
2 Å

C
10Å

D
20 Å

Solution
Question 3
4 / -1

The wavelength of K_α, X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is

A
20

B
60

C
40

D
80

Solution
Question 4
4 / -1

X-ray beam of intensity I₀passes through an absorption plate of thickness d. If absorption coefficient of material of plate is µ, the correct statement regarding the transmitted intensity I of X-rays is

A
I = I₀(1 –e^–µd)

B
I = I₀e^–µd

C
I = I₀ (1 –e_µ/d)

D
I = I₀e^–µ/d

Solution
Question 5
4 / -1

The K_α, X-ray emission line of tungsten occurs at λ = 0.021 nm. The energy difference between K and L levels in this atom is about

A
0.51 MeV

B
1.2 MeV

C
59 KeV

D
13.6 eV

Solution
Question 6
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 7
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 8
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 onan 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 9
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 10
4 / -1

A
1

B
1/4

C
1/2

D
2

Solution