Dual Nature of Radiation and Matter Test

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Dual Nature of Radiation and Matter Test - 83

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Weekly Quiz Competition

Question 1
4 / -1

A radio transmitter operates at a frequency of 880 kHz and a power of 10 kW. The number of photons emittedper second are

A
1.72 × 10³¹

B
1327 × 10³⁴

C
13.27 × 10³⁴

D
0.075 × 10^–34

Solution
Question 2
4 / -1

A photo cell is receiving light from a source placed at a distance of 1 m. If the same source is to be placed at a distance of 2 m, then the ejected electron

A
Moves with one-fourth energy as that of the initial energy

B
Moves with one-fourth of momentum as that of the initial momentum

C
Will be half in number

D
Will be one-fourth in number

Solution
Question 3
4 / -1

Among the following four spectral regions, the photons has the highest energy in

A
Infrared

B
Violet

C
Red

D
Blue

Solution
Question 4
4 / -1

Stopping potential for photoelectrons

A
Does not depend on the frequency of the incident light

B
Does not depend upon the nature of the cathode material

C
Depends on both the frequency of the incident light and nature of the cathode material

D
Depends upon the intensity of the incident light
Question 5
4 / -1

The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be

A
12.4 eV

B
6.2 eV

C
100 eV

D
200 eV
Question 6
4 / -1

The minimum energy required to remove an electron is called

A
Stopping potential

B
Kinetic energy

C
Work function

D
None of these
Question 7
4 / -1

Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times is

A
4

B
1/4

C
2

D
1/2

Solution
Question 8
4 / -1

Work function of a metal is 2.51 eV. Its threshold frequency is

A
5.9 × 10¹⁴ cycles/s

B
6.5 × 10¹⁴ cycles/s

C
9.4 × 10¹⁴ cycles/s

D
6.08 × 10¹⁴ cycles/s

Solution
Question 9
4 / -1

Energy conversion in a photoelectric cell takes place from

A
Chemical to electrical

B
Magnetic to electrical

C
Optical to electrical

D
Mechanical to electrical
Question 10
4 / -1

Which one of the following is true in photo electric emission?

A
Photoelectric current is directly proportional to the amplitude of light of a given frequency

B
Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities

C
Above the threshold frequency, the maximum K.E. of photoelectrons is inversely proportional to the frequency of incident light

D
The threshold frequency depends upon the wavelength of incident light

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Dual Nature of Radiation and Matter Test - 83

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Dual Nature of Radiation and Matter Test - 83

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Question 1

1.72 × 1031

1327 × 1034

13.27 × 1034

0.075 × 10–34

Solution

Question 2

Moves with one-fourth energy as that of the initial energy

Moves with one-fourth of momentum as that of the initial momentum

Will be half in number

Will be one-fourth in number

Solution

Question 3

Infrared

Violet

Red

Blue

Solution

Question 4

Does not depend on the frequency of the incident light

Does not depend upon the nature of the cathode material

Depends on both the frequency of the incident light and nature of the cathode material

Depends upon the intensity of the incident light

Question 5

12.4 eV

6.2 eV

100 eV

200 eV

Question 6

Stopping potential

Kinetic energy

Work function

None of these

Question 7

4

1/4

2

1/2

Solution

Question 8

5.9 × 1014 cycles/s

6.5 × 1014 cycles/s

9.4 × 1014 cycles/s

6.08 × 1014 cycles/s

Solution

Question 9

Chemical to electrical

Magnetic to electrical

Optical to electrical

Mechanical to electrical

Question 10

Photoelectric current is directly proportional to the amplitude of light of a given frequency

Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities

Above the threshold frequency, the maximum K.E. of photoelectrons is inversely proportional to the frequency of incident light

The threshold frequency depends upon the wavelength of incident light

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1.72 × 10³¹

1327 × 10³⁴

13.27 × 10³⁴

0.075 × 10^–34

5.9 × 10¹⁴ cycles/s

6.5 × 10¹⁴ cycles/s

9.4 × 10¹⁴ cycles/s

6.08 × 10¹⁴ cycles/s