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Aashish Rohilla
Subject: Physics
, asked on 23/2/18
every metal has a definite value of work function the photoelectron ejected from metal surface are emitted with different velocity explain why?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 23/2/18
Please ans fast
Q). Two protons
p
1
a
n
d
p
2
have de-Broglie wavelengths
λ
1
a
n
d
λ
2
w
i
t
h
λ
1
>
λ
2
. The two protons are made to enter a uniform magnetic field in a direction normal to the magnetic field. What will be the relation between the radii (
r
1
a
n
d
r
2
) of their paths?
Answer
1
Shivam Sharma
Subject: Physics
, asked on 23/2/18
Solve this:
2.
Figure shows a plot of
1
V
, where V is the accelerating potential,
versus
the de-Broglie wavelength in
λ
the case of two particles having same charge q but different masses m
l
and m
2
. Which line (A or B) represents a particle of large mass?
Delhi 2014
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
A certain light beam consists of
n
photons crossing per unit area per sec with energy E each and
linear momentum
p
each.
How will these three values, (
n, E
and
p
) change if
(i) intensity is doubled and frequency kept constant.
(ii) intensity is kept constant and frequency becomes double?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
Solve this:
Q.34. Two photons have frequencies v and 2v. What is the ratio of the
(i) energies associated with the photons?
(ii) linear momentum associated with the two photons?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
state two factors on which work function of metal depends
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
a photocell emit electron with maximum kinetic energy of 5 electron volt what will be the stopping potential
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
Solve this:
20.
Two beams blue and green are in turn used to emit electron from a certain photosensitive surface.
(a) For which of the two beams will the emitted photoelectrons have greater value of maximum kinetic energy.
(b) If the incident light is pure monochromatic blue light, will all photoelectrons emitted have equal values of kinetic energy? Give reason for your answer.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
Ultravoilet light of a certain frequency is incident on two different photosensitive surfaces with work function W1 and W2(W2>W1).in which of the two cases will the stopping potential be more and why?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
a certain photosensitive surface is exposed to source of light and the corresponding current is being recorded as I .what will be the value of current if the distance between the source and the surface is reduced to half.
Answer
1
Shivam Sharma
Subject: Physics
, asked on 22/2/18
state the important properties of photons which describe the particle nature of light
Answer
1
Maya
Subject: Physics
, asked on 21/2/18
Is it difficult to remove a free electron from copper than from sodium? Why?
Answer
1
Maya
Subject: Physics
, asked on 21/2/18
1. How does the stopping potential applied to a photocell change if the distance between the light source and the cathode of the cell is doubled?
2. On what factor does the retarding potential of a photocell depend?
5. Work function of Na is 2.3 eV. Does sodium shoe photoelectric emission for light on the velocity of photoelectrons?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 20/2/18
The de Broglie wavelength of a body moving with speed V is λ. On its way it loses some of its mass and gains twice the speed. Kinetic energy also increases to twice of its initial value. What will be the new value of de Broglie wavelength?
(ii) A light of wavelength 4000 Å falls on a metal surface whose work is 2 eV. Find (a) the maximum kinetic energy of photoelectrons. (b) the stopping potential.
Answer
2
Archana
Subject: Physics
, asked on 20/2/18
Show that the de Broglie wavelength ‘λ’ of electrons accelerated through a potential difference of V volts can be expressed as 𝜆= 12.3/√𝑉 Å Show that the de Broglie wavelength ‘λ’ of electrons accelerated through a potential difference of V volts can be expressed as 𝜆= 12.3√𝑉 Å
Answer
1
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What are you looking for?
Q). Two protons have de-Broglie wavelengths . The two protons are made to enter a uniform magnetic field in a direction normal to the magnetic field. What will be the relation between the radii () of their paths?
2. Figure shows a plot of , where V is the accelerating potential, versus the de-Broglie wavelength in the case of two particles having same charge q but different masses ml and m2. Which line (A or B) represents a particle of large mass? Delhi 2014
linear momentum p each.
How will these three values, (n, E and p) change if
(i) intensity is doubled and frequency kept constant.
(ii) intensity is kept constant and frequency becomes double?
Q.34. Two photons have frequencies v and 2v. What is the ratio of the
(i) energies associated with the photons?
(ii) linear momentum associated with the two photons?
20. Two beams blue and green are in turn used to emit electron from a certain photosensitive surface.
(a) For which of the two beams will the emitted photoelectrons have greater value of maximum kinetic energy.
(b) If the incident light is pure monochromatic blue light, will all photoelectrons emitted have equal values of kinetic energy? Give reason for your answer.
2. On what factor does the retarding potential of a photocell depend?
5. Work function of Na is 2.3 eV. Does sodium shoe photoelectric emission for light on the velocity of photoelectrons?
(ii) A light of wavelength 4000 Å falls on a metal surface whose work is 2 eV. Find (a) the maximum kinetic energy of photoelectrons. (b) the stopping potential.