Two radiations of photons energies 1 eV and 2.5 eV , successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:
1. 1 : 2
2. 1 : 1 
3. 1 : 5 
4. 1 : 4

Subtopic:  Electron Emission |
To view explanation, please take trial in the course below.
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To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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When monochromatic radiation of intenisty I falls on a metal surface, the number of
photoelectron and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2I, the number of emitted electrons and their maximum kinetic energy are respectively-

1. 2N and T

2. 2N and 2T

3. N and T

4. N and 2T

Subtopic:  Electron Emission |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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In the phenomenon of electric discharge through gases at low pressure, the colored glow in the tube appears as a result of

1.  excitation of electrons in the atoms

2.  collision between the atoms of the gas

3.  collisions between the charged particles emitted from the cathode and the atoms of the gas

4.  collision between different electrons of the atoms of the gas

Subtopic:  Electron Emission |
To view explanation, please take trial in the course below.
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NEET 2023 - Target Batch - Aryan Raj Singh
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A 5 W  emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved 1.0 m away, the number of photoelectrons liberated is reduced by a factor of?

1. 4

2. 8

3. 16

4. 2

Subtopic:  Electron Emission |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology