Answer the following.
the frequency of incident radiation decreases?
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Dual Nature of Radiation and Matter - ISC Class 12 Physics Questions with Answers, Page 2
63 past-paper questions on Dual Nature of Radiation and Matter from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 21-40 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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If kinetic energy of moving electrons is made four times, then their de Broglie wavelength becomes:
- (a)eight times.
- (b)four times.
- (c)two times.
- (d)half.
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Answer the following.
Threshold frequency.
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The de Broglie wavelength of an electron in the first Bohr’s orbit of hydrogen atom is equal to:
- (a)diameter of the first orbit.
- (b)circumference of the first orbit.
- (c)radius of the second orbit.
- (d)$h/2\pi$.
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Solve the following.
Determine the value of Planck's constant 'h'.
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Answer the following.
the intensity of the incident radiation increases?
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The work function of caesium metal is 2.04 eV and a graph between the variation of photoelectric current with a collector plate potential of caesium, for incident radiation is given below. If the frequency of the incident radiation is doubled, which of the following combinations is correct?
- (a)Work function: 2.04 eV, Stopping potential: -0.6 V
- (b)Work function: 4.08 eV, Stopping potential: -0.6 V
- (c)Work function: 4.08 eV, Stopping potential: -3.24 V
- (d)Work function: 2.04 eV, Stopping potential: -3.24 V
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Answer the following.
How are energy ('E') and momentum ('p') of a photon related to each other?
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It was found that certain metals like Zinc, Cadmium, Magnesium, etc. are photosensitive only to ultraviolet light. However, some alkali metals such as Lithium, Sodium, and Potassium, were photosensitive even to visible light. If ultraviolet light of the same frequency and the same intensity is incident on Zinc and Sodium metal, then which of the following quantities may be the same?
- (a)Kinetic energy of the photoelectrons emitted by the two metals.
- (b)Photoelectric current flowing through the two metals.
- (c)Stopping potential.
- (d)The potential energy of the photoelectrons emitted by the two metals.
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Derive the following.
The graphs below show the variation of the stopping potential $V_S$ with the frequency ($\nu$) of the incident radiations for two different photosensitive materials $M_1$ and $M_2$.
Express work function for $M_1$ and $M_2$ in terms of Planck’s constant ($h$) and Threshold frequency and charge of the electron ($e$).
If the values of stopping potential for $M_1$ and $M_2$ are $V_1$ and $V_2$ respectively then show that the slope of the lines equals to $\frac{V_1 - V_2}{\nu_{01} - \nu_{02}}$ for a frequency, $\nu > \nu_{02}$ and also $\nu > \nu_{01}$.
To show: \frac{V_1 - V_2}{\nu_{01} - \nu_{02}}
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Answer in one word.
Name any one phenomenon where moving particles behave like waves.
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Draw the graph described below.
(i)[1.5]
Plot a labelled graph of stopping potential ($V_s$) versus frequency ($\nu$) of incident UV radiation.
Draw: graph of stopping potential Vs versus frequency nu of incident radiation
(ii)[1.5]
State how the value of Planck’s constant can be determined from this graph.
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Answer the following.
photocurrent?
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Answer the following.
kinetic energy of the most energetic photoelectron?
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Choose the correct option.
de Broglie wavelength of moving particles does not depend on their:
- (a)velocity.
- (b)mass.
- (c)size.
- (d)kinetic energy.
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Solve the following.
Find the value of work function of the metal.
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Answer the following.
Work function.
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Answer the following.
What is meant by “Dual nature of matter”?
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Answer the following.
In an experiment on photo electric effect, how does stopping potential change, if at all, when intensity of incident monochromatic UV radiation is increased?
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Answer the following.
Ultraviolet light is incident on metals P, Q and R, having work functions $8\text{ eV}$, $2\text{ eV}$ and $4\text{ eV}$ respectively.
(a) Which metal has lowest threshold frequency for photoelectric effect?
(b) For which metal is the value of $E_{\max}$ minimum?
(Note: $E_{\max}$ is maximum kinetic energy of the emitted photoelectrons.)
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