NEET 2022 Phase 1 | Dual Nature of Radiation and Matter Question 7 | Physics

When two monochromatic lights of frequency, v and $${v \over 2}$$ are incident on a photoelectric metal, their stopping potential becomes $${{{V_s}} \over 2}$$ and V_s respectively. The threshold frequency for this metal is

$${2 \over 3}$$v

$${3 \over 2}$$v

NEET 2021

MCQ (Single Correct Answer)

-1

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it delivers the power of 3.3 $$\times$$ 10^$$-$$3 watt will be : (h = 6.6 $$\times$$ 10^$$-$$34 Js)

10¹⁵

10¹⁸

10¹⁷

10¹⁶

NEET 2021

MCQ (Single Correct Answer)

-1

An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength $$\lambda$$_d, then :

$$\lambda = \left( {{{2h} \over {mc}}} \right){\lambda _d}^2$$

$$\lambda = \left( {{{2m} \over {hc}}} \right){\lambda _d}^2$$

$${\lambda _d} = \left( {{{2mc} \over h}} \right){\lambda ^2}$$

$$\lambda = \left( {{{2mc} \over h}} \right){\lambda _d}^2$$

NEET 2021

MCQ (Single Correct Answer)

-1

A radioactive nucleus
$$_Z^AX$$ $$\to$$ $${}_{Z - 1}B$$ $$\to$$ $${}_{Z - 3}C$$ $$\to$$ $${}_{Z - 2}D$$,
where Z is the atomic number of element X. The possible decay particles in the sequence are :

$$\beta$$^$$-$$, $$\alpha$$, $$\beta$$⁺

$$\alpha$$, $$\beta$$^$$-$$, $$\beta$$⁺

$$\alpha$$, $$\beta$$⁺, $$\beta$$^$$-$$

$$\beta$$⁺, $$\alpha$$, $$\beta$$^$$-$$

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