1
NEET 2022 Phase 1
+4
-1

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 Vs respectively. The threshold frequency for this metal is

A
2v
B
3v
C
$${2 \over 3}$$v
D
$${3 \over 2}$$v
2
NEET 2021
+4
-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)
A
1015
B
1018
C
1017
D
1016
3
NEET 2021
+4
-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 :
A
$$\lambda = \left( {{{2h} \over {mc}}} \right){\lambda _d}^2$$
B
$$\lambda = \left( {{{2m} \over {hc}}} \right){\lambda _d}^2$$
C
$${\lambda _d} = \left( {{{2mc} \over h}} \right){\lambda ^2}$$
D
$$\lambda = \left( {{{2mc} \over h}} \right){\lambda _d}^2$$
4
NEET 2021
+4
-1
$$_Z^AX$$ $$\to$$ $${}_{Z - 1}B$$ $$\to$$ $${}_{Z - 3}C$$ $$\to$$ $${}_{Z - 2}D$$,
where Z is the atomic number of element X. The possible decay particles in the sequence are :
A
$$\beta$$$$-$$, $$\alpha$$, $$\beta$$+
B
$$\alpha$$, $$\beta$$$$-$$, $$\beta$$+
C
$$\alpha$$, $$\beta$$+, $$\beta$$$$-$$
D
$$\beta$$+, $$\alpha$$, $$\beta$$$$-$$
NEET Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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