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20 unit = ……………. Watt-second. (20xx10^...

20 unit = ……………. Watt-second.
`(20xx10^(3),3.6xx10^(6),7.2xx10^(7))`

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The correct Answer is:
`7.2xx10^(7)`
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The threshold wavelength of Na element is 6800 Å.Its work function is ………. xx10^(-19)J.(h=6.625xx10^(-34)Js,C=3xx10^(8)ms^(-1))

In photoelectric effect threshold wavelength of sodium is 5000Å .Find its work function. [ h=6.6xx10^(-34)Js,c=3xx10^(8)m//s,1eV=1.6xx10^(-19)Js]

Wavelength of photon having 35 keV energy will be…….. (h=6.625xx10^(-34))J-s,c=3xx10^(8)ms^(-1),1eV=1.6xx10^(-19)J) .

The wavelength of photon having energy of 35 keV is …….. (h=6.625xx10^(-34)J-s, c=3xx10^(8)ms^(-1), 1eV=1.6xx10^(-19)J) .

When the electromagnetic radiation of maximum wavelength of 2480 nm is incident on semiconductor. The band gap energy of semiconductor is ……eV. [6.6xx10^(-34)JS, C=3xx10^(8)m//s, 1eV=1.6xx10^(-19)J]

The magnetic field of a beam emerging from a filter facing a floodlight is given by B=12xx10^(-8)sin (1.20xx10^(7)z-3.60xx10^(15)t) T. What is the average intensity of the beam ?

Work function of metal is 1.6 eV for which maximum wavelength photoelectric emission can be obtained ? [h=6.6xx10^(-34)JS,c=3xx10^(8)m//s]eV=1.6xx10^(-19) J]

Calculate the wavelength of electron if its kinetic energy is 3.0xx10^(-25) J. Mass of electron is 9.1xx10^(-31) kg. (h = 6.626xx10^(-34) JS)

Show with regards to significant figure (i) 908 + 2.76 (ii) 999-989 (iii) 4.0 xx 10^(4) - 2.5 xx 10^(2) (iv) 4.0 xx 10^(4) - 2.5 xx 10^(5) (v) 6.75 xx 10^(3) + 4.52 xx 10^(2) (vi) 625 + 125

KUMAR PRAKASHAN-WORK AND ENERGY -QUESTION & ANSWER (FILL IN THE BLANKS BY SELECTING THE CORRECT ALTERNATIVE FROM THOSE GIVEN IN THE BRACKET)
  1. As the angle between force and displacement increases, the magnitude o...

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  2. On pressing a spring its potential energy ………….. (remains constant, ...

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  3. …………… is a scalar quantity. (Force, Work, Displacement)

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  4. The unit of power is …………… (joule, watt, unit)

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  5. When an object of mass 10 kg is at height ………… m, its potential energy...

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  6. 1MW=……………W (10^(3),10^(5),10^(6))

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  7. 20 unit = ……………. Watt-second. (20xx10^(3),3.6xx10^(6),7.2xx10^(7))

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  8. The total energy of a body falling freely towards the earth …………… (i...

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  9. 5 electric bulbs of 100 W are used for 8 hours, then …………… unit of ene...

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  10. Power of a water-pump is 2kW ………….. Litre of water can be lifted to a ...

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  11. As the angle between force and displacement increases, the magnitude o...

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  12. On pressing a spring its potential energy ………….. (remains constant, ...

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  13. …………… is a scalar quantity. (Force, Work, Displacement)

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  14. The unit of power is …………… (joule, watt, unit)

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  15. When an object of mass 10 kg is at height ………… m, its potential energy...

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  16. 1MW=……………W (10^(3),10^(5),10^(6))

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  17. 20 unit = ……………. Watt-second. (20xx10^(3),3.6xx10^(6),7.2xx10^(7))

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  18. The total energy of a body falling freely towards the earth …………… (i...

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  19. 5 electric bulbs of 100 W are used for 8 hours, then …………… unit of ene...

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  20. Power of a water-pump is 2kW ………….. Litre of water can be lifted to a ...

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