NEET 2013 (Karnataka) | Dual Nature of Radiation and Matter Question 28 | Physics

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V₀. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :

V₀/2

V₀

4V₀

2V₀

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)

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

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

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

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

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