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Archana
Subject: Physics
, asked on 20/2/18
work function of photo electrode in an phototube is 4.2 eV. How ill the photo tube respond when a radiation of 300nm strikes on it?
Answer
1
Ayushi Aggarwal
Subject: Physics
, asked on 18/2/18
Ques 18:
18. What is the de Broglie wavelength of a nitrogen molecule in air of 300 K? Assume that the molecule is moving with the root mean square speed of molecules at this temperature. (Atomic mass of Nitrogen = 14.0075 u)
Answer
1
Afrah Baber Khan
Subject: Physics
, asked on 17/2/18
Write Einstein's photoelectric equation and point out any two features observed in photoelectric effect which can be explained using this equation.
Answer
1
Akshit Chaturvedi
Subject: Physics
, asked on 14/2/18
A proton and an alpha particle have the same de -Broglie wavelength find the ratio of their acceleration potentials . this is how I solved it :
Answer
2
Shivam Sharma
Subject: Physics
, asked on 8/2/18
Solve this:
Q.
Derive an expression for the de-Broglie wavelength associated with an electron accelerated through a potential V. Draw a schematic diagram of a localised wave describing the wave nature of the moving electron.
Foreign 2009
Answer
1
Alifa
Subject: Physics
, asked on 3/2/18
X rays fall on a photo sensitive surface to cause photo electric emission. Assuming that the work function of the surface can be neglected, find the relation between the de-broglie wavelength(lamda) of the electron emitted to the energy(E) of the incident photons. Draw the nature of the graph for lamda and a function of E
Answer
1
Sofiya Parihar
Subject: Physics
, asked on 1/2/18
Answer question.no.4
Q.4. The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B.
Answer
3
Prabal Krishna Sarania
Subject: Physics
, asked on 27/1/18
Show mathematically how Bohr's postulate of quantization of Orbital angular momentum in hydrogen atom is explained by De broglie's hypothesis
Answer
2
Awadhesh Thakkar
Subject: Physics
, asked on 26/1/18
Plz solve nig
Q12. A spherical shell is cut into two pieces along a chord as shown in figure. P is a point on the plane of the chord. The gravitational field at P due to the upper part is I
1
and that due to the lower part is I
2
. What is the relation between them-
(1) I
1
> I
2
(2) I
1
< I
2
(3) I
1
= I
2
(4) No definite relation
Q13. If light travels a distance x in t
1
sec in air and 10 x distance in t
2
sec in a medium, the critical angle of the medium will be :-
1
tan
-
1
t
1
t
2
2
sin
-
1
t
1
t
2
(
3
)
sin
-
1
10
t
1
t
4
tan
-
1
10
t
1
t
2
Answer
1
Awadhesh Thakkar
Subject: Physics
, asked on 26/1/18
Solve 36.
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Answer
1
Peter Ax
Subject: Physics
, asked on 23/1/18
in a photo electric experiment it was found that the stopping potential decreases from 1.85v to 0.82v as the wavelength of the incident light is varied from 300nm to 400nm. calculate the plank's constant
Answer
1
Abhishek
Subject: Physics
, asked on 22/1/18
Mention three properties of em wave which cannot be determined by wave theory of light but can be proved by Einstein, s equation??
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 12/1/18
The given graph show the variation of the stopping potential V
s
with the frequency (V) of the incident radiations for two different photosensitive materials M
1
and M
2
(i) What are the values of work functions for M
1
and M
2
?
(ii) The values of the stopping potential M
1
and M
2
for a frequency v
3
(>v
02
) of the incident radiation are V
1
and V
2
respectively . Show that the slope of the lines equals
V
1
-
V
2
ν
02
-
ν
01
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 7/1/18
the stopping potential varies linearly with the frequency of incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces. Give reason
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 7/1/18
the short wavelength limit for the Lyman series of the hydrogen spectrum is 913.4A calculate the short wavelength limit for Balmer series of the hydrogen spectrum
Answer
1
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What are you looking for?
18. What is the de Broglie wavelength of a nitrogen molecule in air of 300 K? Assume that the molecule is moving with the root mean square speed of molecules at this temperature. (Atomic mass of Nitrogen = 14.0075 u)
Q. Derive an expression for the de-Broglie wavelength associated with an electron accelerated through a potential V. Draw a schematic diagram of a localised wave describing the wave nature of the moving electron. Foreign 2009
Q.4. The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B.
Q12. A spherical shell is cut into two pieces along a chord as shown in figure. P is a point on the plane of the chord. The gravitational field at P due to the upper part is I1 and that due to the lower part is I2. What is the relation between them-
(1) I1 > I2 (2) I1 < I2
(3) I1 = I2 (4) No definite relation
Q13. If light travels a distance x in t1 sec in air and 10 x distance in t2 sec in a medium, the critical angle of the medium will be :-
(i) What are the values of work functions for M1 and M2 ?
(ii) The values of the stopping potential M1 and M2 for a frequency v3(>v02) of the incident radiation are V1 and V2 respectively . Show that the slope of the lines equals