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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

1 Hard

1 of 1

Application +4 | -1

X

-ray pulse of wavelength

4.9\;\mathop A\limits^ \circ

is sent through a section of Wilson cloud chamber containing a super saturated gas, and tracks of photoelectron ejected from the gaseous atoms are observed. Two groups of tracks of lengths

1.40\;cm

and

2.02\;cm

are noted. If the range-energy relation for cloud chamber is given by

R = \alpha E

with

\alpha = 1cm/keV,

obtain the binding energies of the two levels from which electrons are emitted. Given

h = 6.63 \times {10^{ - 34}}J - s,e = 1.6 \times {10^{ - 19}}J

View answer and explanation

Correct option: A

0.52\;KeV

Option A (

0.52\;KeV

) is correct because it represents the difference between the photon energy and the kinetic energy of the emitted photoelectrons, calculated using the range-energy relation.

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If the Broglie wavelengths associated with a proton and an

\alpha

- particle are equal, then the ratio of velocities of the proton and the

\alpha

- particle will be: If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately In photo-electric effect, when graph is plotted for stopping potential versus frequency of incident light, for different metals, then: The radiation corresponding to

3 \to 2

transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of

3 \times {10^{ - 4}}\,T.

If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to The shortest wavelength of

X

-rays emitted from an

X

-ray tube depends on the Planck’s constant has the dimensions of