NEET 2016 Phase 2 | Dual Nature of Radiation and Matter Question 26 | Physics

Electrons of mass m with de-Broglie wavelength $$\lambda $$ fall on the target in an X-ray tube. The cutoff wavelength ($$\lambda $$₀) of the emitted X-ray is

$$\lambda $$₀ = $${{2mc{\lambda ^2}} \over h}$$

$${\lambda _0} = {{2h} \over {mc}}$$

$${\lambda _0} = {{2{m^2}{c^2}{\lambda ^3}} \over {{h^2}}}$$

$${\lambda _0} = \lambda $$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is

$$c{\left( {2mE} \right)^{{1 \over 2}}}$$

$${1 \over c}{\left( {{{2m} \over E}} \right)^{{1 \over 2}}}$$

$${1 \over c}{\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$

$${\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

When a metallic surface is illuminated with radiation of wavelength $$\lambda $$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 $$\lambda $$, the stopping potential is $${V \over 4}$$. The threshold wavelength for the metallic surface is

$${5 \over 2}\lambda $$

3$$\lambda $$

4$$\lambda $$

5$$\lambda $$

AIPMT 2015

MCQ (Single Correct Answer)

-1

Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is

$$ \ge $$ 2.8 $$ \times $$ 10^$$-$$9 m

$$ \le $$ 2.8 $$ \times $$ 10^$$-$$12 m

< 2.8 $$ \times $$ 10^$$-$$10 m

< 2.8 $$ \times $$ 10^$$-$$9 m

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution