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When two different materials, $A$ and $B$ having atomic numbers, $Z_{1}$ and $Z_{2}$ are used as the target in Coolidge $γ$ -ray tube at different operating voltage, $V_{1}$ and $V_{2}$ , respectively, their spectrums are found as below.

The correct relation is

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Important Questions on Atomic Physics

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Physics>Modern Physics>Atomic Physics>Moseley’s Law

An electron beam is accelerated by a potential difference

V

to hit a metallic target to produce

X -

rays. It produces continuous as well as characteristic

X -

rays. If

λ_{m i n}

is the smallest possible wavelength of

X -

ray in the spectrum, the variation of

\log (λ_{m i n})

with

\log (V)

is correctly represented in :

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

The minimum wavelength of

X

-rays produced by an electron accelerated through a potential difference of

V

volts is proportional to:

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

Electrons of mass,

m

with de-Broglie wavelength,

λ

fall on the target in an X-ray tube. The cutoff wavelength,

(λ_{0})

of the emitted X-ray is

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

Wavelength of characteristic X-ray depends on which property of target?

(where, A = Mass number, Z = Atomic number)

HARD

Physics>Modern Physics>Atomic Physics>Moseley’s Law

The

K_{α}

X-ray of molybdenum has wavelength

0.071 nm

. If the energy of a molybdenum atom with a

K

electron knocked out is

27.5 keV

, the energy of this atom when an

L

electron is knocked out will be

keV

. (Round off to the nearest integer )

[h = 4.14 \times 10^{- 15} eV s, c = 3 \times 10^{8} {m s}^{- 1}]

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

An X-ray tube is operated at

1.24

million volt. The shortest wavelength of the produced photon will be:

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

The luminous border that surrounds the profile of a mountain just before sun rises behind it, is an example of

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Physics>Modern Physics>Atomic Physics>Moseley’s Law

In an

X

-ray tube, electrons emitted from a filament (cathode) carrying current

I

hit a target (anode) at a distance

d

from the cathode. The target is kept at a potential

V

higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current

I

is decreased to

\frac{I}{2},

the potential difference

V

is increased to

2 V,

and the separation distance

d

is reduced to

\frac{d}{2},

then

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Physics>Modern Physics>Atomic Physics>Moseley’s Law

In a diffraction pattern due to a single slit of width

' a'

, the first minimum is observed at an angle

30 °

when light of wavelength

500 nm

is incident on the slit. The first secondary maximum is observed at an angle of

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Physics>Modern Physics>Atomic Physics>Moseley’s Law

K_{α}

radiation of

M o (Z = 42)

has a wavelength

0.71 \overset{o}{A}

, then the wavelength of the corresponding radiation of

C u (Z = 29)

EASY

Physics>Modern Physics>Atomic Physics>Moseley’s Law

Which wave or ray is produced due to decelerating or accelerating charged particles?

HARD

Physics>Modern Physics>Atomic Physics>Moseley’s Law

A student is jogging on a straight path with the speed $5.4 km$ per hour. Perpendicular to the path is kept a pipe with its opening $8 m$ from the road (see figure). Diameter of the pipe is $0.45 m$ At the other end of the pipe is a speaker emitting sound of $1280 Hz$ towards the opening of the pipes. As the student passes in front of the pipe, she hears the speaker sound for $T$ seconds. $T$ is in the range (take speed of sound, $320 {ms}^{- 1}$ ):