A 200 W sodium street lamp emits yellow light of wavelength 0.6 . Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn -particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de-Broglie wavelength associated with the particle will be :
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by:
1. | increasing the filament current. |
2. | decreasing the filament current. |
3. | decreasing the potential difference between the anode and filament. |
4. | increasing the potential difference between the anode and filament. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA radioactive nucleus of mass M emits a photon of frequency and the nucleus will recoil. The recoil energy will be
1.
2. zero
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. 1.3 V
2. 0.5 V
3. 2.3 V
4. 1.8 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. 1:2
2. 1:1
3. 1:5
4. 1:4
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. decrease by 2 times
2. decrease by 4 times
3. increase by 4 times
4. increase by 2 times
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA source S1 is producing 1015 photons per sec of wavelength 5000 Å. Another source S2 is producing 1.02×1015 photons per second of wavelength 5100 Å. Then, (power of S2)/(power of S1) is equal to
1. 1.00
2. 1.02
3. 1.04
4. 0.98
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
1. 2.4 V
2. -1.2 V
3. -2.4 V
4. 1.2 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology