JEE Main 2021 (Online) 22th July Evening Shift | Dual Nature of Radiation Question 88 | Physics

An electron of mass m_e and a proton of mass m_p are accelerated through the same potential difference. The ratio of the de-Broglie wavelength associated with the electron to that with the proton is

$${{{m_e}} \over {{m_p}}}$$

$${{{m_p}} \over {{m_e}}}$$

$$\sqrt {{{{m_p}} \over {{m_e}}}} $$

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

An electron having de-Broglie wavelength $$\lambda$$ is incident on a target in a X-ray tube. Cut-off wavelength of emitted X-ray is :

$${{2{m^2}{c^2}{\lambda ^2}} \over {{h^2}}}$$

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

$${{hc} \over {mc}}$$

JEE Main 2021 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-1

The radiation corresponding to 3 $$\to$$ 2 transition of a hydrogen atom falls on a gold surface to generate photoelectrons. The electrons are passed through a magnetic field of 5 $$\times$$ 10^$$-$$4 T. Assume that the radius of the largest circular path followed by these electrons is 7 mm, the work function of the metal is : (Mass of electron = 9.1 $$\times$$ 10^$$-$$31 kg)

1.36 eV

1.88 eV

0.82 eV

0.16 eV

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The speed of electrons in a scanning electron microscope is 1 $$\times$$ 10⁷ ms^-1. If the protons having the same speed are used instead of electrons, then the resolving power of scanning proton microscope will be changed by a factor of :

$${1 \over {1837}}$$

1837

$${\sqrt {1837} }$$

$${1 \over {\sqrt {1837} }}$$

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