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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology