If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :
1. 25
2. 75
3. 60
4. 50
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor photoelectric emission from certain metals, the cutoff frequency is . If radiation of frequency 2 impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(m is the electron mass)
1.
2.
3.
4.
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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 & BiologyA 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 & Biology