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Class 12 Physics
Dual Nature Of Radiation And Matter
Quiz 1
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De-Broglie equation states the:
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dual nature
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particle nature
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wave nature
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none of these
Explanation
dual nature
Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them?
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Energy
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Time period
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Frequency
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Momentum
Explanation
Momentum
Kinetic energy of emitted electrons depends upon :
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frequency
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intensity
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nature of atmosphere surrounding the electrons
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none of these
Explanation
frequency
De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):
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\(\frac{h}{\sqrt{2mE}}\)
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\(\frac{h}{2mE}\)
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\(\frac{\sqrt{2mE}}{h}\)
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\(\frac{h}{mE}\)
Explanation
\(\frac{h}{\sqrt{2mE}}\)
The ratio of specific charge of an alpha particle to the proton is:
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1 : 2
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2 : 1
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4 : 1
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1 : 4
Explanation
1 : 2
In Thomson's experiment number of parabola gives :
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the no. of electrons present in element
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the no. of proton present in element
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the no. of neutrons present in element
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the no. of isotopes of the element present
Explanation
the no. of isotopes of the element present
The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:
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8 × 10
14
Hz
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8 × 10
10
Hz
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5 × 10
10
Hz
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4 × 10
14
Hz
Explanation
8 × 10
14
Hz
The strength of photoelectric current depends upon :
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angle of incident radiation
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frequency of incident radiation
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intensity of incident radiation
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distance between anode and cathode
Explanation
frequency of incident radiation
The momentum of an electron that emits a wavelength of 2 Å. will be:
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6.4 × 10
-36
kgms
-1
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3.3 × 10
-24
kgms
-1
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3.3 × 10
-34
kgms
-1
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none of these
Explanation
3.3 × 10
-24
kgms
-1
Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:
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Millikan
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Planck
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Faraday
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Boyle
Explanation
Faraday
Millikan's oil drop experiment makes use of:
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Stokes' law
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Boyle's law
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Gas equation
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Bernoulli's theorem
Explanation
Stokes' law
X-rays are:
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deflected by an electric field
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deflected by a magnetic field
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deflected by both electric and magnetic fields
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not deflected by electric and magnetic fields
Explanation
not deflected by electric and magnetic fields
In photo electric emission, for alkali metals the threshold frequency lies in the:
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visible region
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ultraviolet region
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infrared region
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far end of the infrared region
Explanation
visible region
Which of the following radiations cannot eject photo electrons?
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ultraviolet
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infrared
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visible
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X-rays
Explanation
infrared
What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?
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\(\frac{12.3}{V^2}\) Å
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\(\frac{12.3}{V}\) Å
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\(\frac{12.2}{V^2}\) Å
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None of these
Explanation
\(\frac{12.3}{V^2}\) Å
What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?
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12.3 Å
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1.23 Å
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0.123 Å
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None of these
Explanation
1.23 Å
What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?
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\(\frac{12.3}{√V}\) Å
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\(\frac{12.3}{V}\) Å
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\(\frac{12.2}{V^2}\) Å
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None of these
Explanation
None of these
When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
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no electrons are emitted
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photons are emitted
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electrons of higher energy are emitted
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electrons of lower energy are emitted
Explanation
no electrons are emitted
The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms
-1
, in terms of Planck's constant h, is given by (in metre):
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10
5
h
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10
6
h
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10
-3
h
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10
3
h
Explanation
10
6
h
Evidence of the wave nature of light cannot be obtained from:
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diffraction
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interference
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doppler effect
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reflection
Explanation
reflection
0 h : 0 m : 1 s
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