NEET 2013 (Karnataka) | Dual Nature of Radiation and Matter Question 33 | Physics

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NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is

$${{3.08} \over {\sqrt T }}\mathop A\limits^ \circ $$

$${{0.308} \over {\sqrt T }}\mathop A\limits^ \circ $$

$${{0.0308} \over {\sqrt T }}\mathop A\limits^ \circ $$

$${{30.8} \over {\sqrt T }}\mathop A\limits^ \circ $$

NEET 2013

MCQ (Single Correct Answer)

-1

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

The angular width of the central maximum will decrease.

The angular wifth of the central maximum will be unaffected.

Diffraction pattern is not observed on the screen in the case of electrons.

The angular width of the central maximum of the diffraction pattern will increase.

NEET 2013

MCQ (Single Correct Answer)

-1

For photoelectric emission from certain metal the cutoff frequency is $$\upsilon $$. If radiation of frequency 2$$\upsilon $$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

$$\sqrt {{{2h\upsilon } \over m}} $$

$$2\sqrt {{{h\upsilon } \over m}} $$

$$\sqrt {{{h\upsilon } \over {\left( {2m} \right)}}} $$

$$\sqrt {{{h\upsilon } \over m}} $$

NEET 2013

MCQ (Single Correct Answer)

-1

The wavelength $$\lambda $$_e of an electron and $$\lambda $$_p of a photon of same energy E are related by

$${\lambda _p} \propto \sqrt {{\lambda _e}} $$

$${\lambda _p} \propto {1 \over {\sqrt {{\lambda _e}} }}$$

$${\lambda _p} \propto {\lambda _e}^2$$

$${\lambda _p} \propto {\lambda _e}$$

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