If the wavelength of light incident on photo-electric cell be reduced from 4000A<sup>0</sup>?to3600A<sup>0</sup>,then what will be the change in the cut off potential.

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GS Set-1
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Dual Nature of Radiation
38

Dual Nature of Radiation MCQ with Answers

38) If the wavelength of light incident on photo-electric cell be reduced from 4000A⁰?to3600A⁰,then what will be the change in the cut off potential.

0.42Volt

0.43Volt

0.34Volt

0.30Volt

Answer is:

0.34Volt

Explanation:

use W=hV_o and E = hc/(/lambda)

Dual Nature of Radiation MCQ with Answers

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Related Dual Nature of Radiation MCQ with Answers

39) If the voltage across the electrodes of a cathode ray tube is 500 volts then energy gained by the electrons is

7??10^?17?J

9??10^?17?J

8??10^?17?J

6??10^?17?J

Answer is:

8??10^?17?J

Explanation:

Use E=eV

40) Which of the following is correct about photoelectric cell?

converts light energy into heat energy

converts electric into light energy

converts light energy into sound energy

converts light energy into electric energy

Answer is:

converts light energy into electric energy

Explanation:

a device using a photoelectric effect to generate current.

41) If a beam goes undeflected in Thomson's experiment, then speed of the electron is

5??10⁶?m/s

6??10⁶?m/s

5.5??10⁶?m/s

6.5??10⁶?m/s

Answer is:

5??10⁶?m/s

Explanation:

Use BeV=eE

42) When an electron enters a magnetic field of 0.01 T with a speed of?10⁷ms^?1?it describes a circle of radius 6 mm there. Then specific charge of the electron is given by

1.87??10¹¹Ckg^?1

1.77??10¹¹Ckg^?1

1.67??10¹¹Ckg^?1

1.57??10¹¹Ckg^?1

Answer is:

1.67??10¹¹Ckg^?1

Explanation:

Use BeV=eE

Dual Nature of Radiation MCQ with Answers

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38) If the wavelength of light incident on photo-electric cell be reduced from 4000A0?to3600A0,then what will be the change in the cut off potential.

0.34Volt

Dual Nature of Radiation MCQ with Answers

Related Dual Nature of Radiation MCQ with Answers

39) If the voltage across the electrodes of a cathode ray tube is 500 volts then energy gained by the electrons is

8??10?17?J

40) Which of the following is correct about photoelectric cell?

converts light energy into electric energy

41) If a beam goes undeflected in Thomson's experiment, then speed of the electron is

5??106?m/s

42) When an electron enters a magnetic field of 0.01 T with a speed of?107ms?1?it describes a circle of radius 6 mm there. Then specific charge of the electron is given by

1.67??1011Ckg?1

Dual Nature of Radiation MCQ with Answers

38) If the wavelength of light incident on photo-electric cell be reduced from 4000A⁰?to3600A⁰,then what will be the change in the cut off potential.

8??10^?17?J

5??10⁶?m/s

42) When an electron enters a magnetic field of 0.01 T with a speed of?10⁷ms^?1?it describes a circle of radius 6 mm there. Then specific charge of the electron is given by

1.67??10¹¹Ckg^?1