1
JEE Main 2016 (Offline)
+4
-1
Radiation of wavelength $$\lambda ,$$ is incident on a photocell. The fastest emitted electron has speed $$v.$$ If the wavelength is changed to $${{3\lambda } \over 4},$$ the speed of the fastest emitted electron will be:
A
$$= v{\left( {{4 \over 3}} \right)^{{1 \over 2}}}$$
B
$$= v{\left( {{3 \over 4}} \right)^{{1 \over 2}}}$$
C
$$> v{\left( {{4 \over 3}} \right)^{{1 \over 2}}}$$
D
$$< v{\left( {{4 \over 3}} \right)^{{1 \over 2}}}$$
2
JEE Main 2015 (Offline)
+4
-1
Match List - $${\rm I}$$ (Fundamental Experiment) with List - $${\rm II}$$ (its conclusion) and select the correct option from the choices given below the list:

A
$$A - ii;\,\,B - i,\,\,C - iii$$
B
$$A - iv;\,\,B - iii,\,\,C - ii$$
C
$$A - i;\,\,B - iv,\,\,C - iii$$
D
$$A - ii;\,\,B - iv,\,\,C - iii$$
3
JEE Main 2013 (Offline)
+4
-1
The anode voltage of a photocell is kept fixed. The wavelength $$\lambda$$ of the light falling on the cathode is gradually changed. The plate current $$I$$ of the photocell varies as follows :
A
B
C
D
4
AIEEE 2012
+4
-1
This question has Statement 1 and Statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement 1 : Davisson - Germer experiment established the wave nature of electrons.

Statement 2 : If electrons have wave nature, they can interfere and show diffraction.
A
Statement 1 is true, Statement 2 is false
B
Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation for Statement 1.
C
Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of Statement 1.
D
Statement 1 is false, Statement 2 is true.
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Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
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Calculus
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