11. |
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Answer:
Option (b) |
12. |
_____
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Answer:
Option (b) |
13. |
When frequencies f1 and f2 are incident on two identical photo sensitive surfaces, maximum velocities of photo electrons of mass m are v1 and v2, hence _____ .
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Answer:
Option (a) |
14. |
A proton and an α-particle are passed through same potential difference. If their initial velocity is zero, the ratio of their de Broglie's wavelength after getting accelerated is.
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Answer:
Option (d) |
15. |
Mass of proton in motion is _____
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Answer:
Option (d) |
16. |
If the momentum of an electron is required to be same as that of wave of 5200 Å wavelength, its velocity should be _____ m s-1.
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Answer:
Option (c) |
17. |
Wavelength of an electron having energy 10 keV is _____ Å.
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Answer:
Option (a) |
18. |
The uncertainty in position of a particle is same as it's de Broglie wavelength, uncertainty in its momentum is ______
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Answer:
Option (a) |
19. |
A proton and electron are lying in a box having unpenetrable walls, the ratio of uncertainty in their velocities are _____ [me= mass of electron and mp = mass of proton.]
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Answer:
Option (a) |
20. |
When α-particles are accelerated under the p.d. of V volt, their de Broglie's wavelength is _____ Å [ Mass of α-particle is 6.4 × 10-27 kg and its charge is 3.2 × 10-19 C. ]
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Answer:
Option (c) |