Home
Class 12
CHEMISTRY
In a photoelectric effect experiment, th...

In a photoelectric effect experiment, the kinetic energy of an emitted electron is `1.986 xx 10^(-19) J` , when a radiation of frequency `1.0 xx 10^15 s^(-1)` hits the metal. What is the threshold frequency of the metal (in `s^(-1)` )?(Planck's constant ` = 6.62 xx 10^(-34)` Js)

A

`7.0 xx 10^14`

B

`5.8886 xx 10^14`

C

`7.0 xx 10^(-15)`

D

`7.0 xx 10^15`

Text Solution

Verified by Experts

The correct Answer is:
A
Given , kinetic energy of an emitted electron ` = 1.986 xx 10^(-19) J`
Frequency of radiation ` = 1 xx 10^15 s^(-1)`
Threshold frequency , `v_0 = ? `
From equation ,
`hv - hv_0 = KE`
` h(v - v_0) = KE`
`6.62 xx 10^(-34) J -s (1 xx 10^15 s^(-1) - v_0) = 19.986 xx 10^(-19) J`
` 1 xx 10^15 s^(-1) - v_0 = (1.986 xx 10^(-19) J)/(6.62 xx 10^(-34) J - s)`
`v_0 = 1 xx 10^15 s^(-1) -(1.986 xx 10^(-19) J)/(6.62 xx 10^(-34) J-s)`
`v_0 = 1 xx 10^15 - 0.3 xx 10^15 s^(-1)`
` v_0 = 7.0 xx 10^14 s^(-1)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • QUESTION PAPER 2019(SOLVED)

    TS EAMCET PREVIOUS YEAR PAPERS|Exercise CHEMISTRY|40 Videos

  • TS EAMCET 2015

    TS EAMCET PREVIOUS YEAR PAPERS|Exercise CHEMISTRY|40 Videos

Similar Questions

Explore conceptually related problems

Calculate the kinetic energy of emitted electron when a radiation with frequency of 2 xx 10^(15) sec^(-1) hits the metal surface.

The threshold frequency v, for a metal 7.0xx10^(14)s^(-1) . Calculate the kinetic energy' of an electron emitted when radiation of frequency v=1.0xx10^(15)s^(-1) hits the metal.

Knowledge Check

  • Mass of electron = 9.1 xx 10^(-3) kg . The kinetic energy of an electron is 4.55 xx 10^(-25)J . What is its wavelength (in nm) ?

    A
    728
    B
    850
    C
    896
    D
    786

    • Similar Questions

    Explore conceptually related problems

    The threshold frequency for a metal is 7.0 xx 10^(14)S^(-1) . Calculate the kinetic energy of an electron emitted when radiation of frequency 10^(15)s^(-1) hits the metal.

    The threshold frequency for a metal is 7.0 xx 10^(14) s^(-1) . Calculate the kinetic energy of an electron emitted when radiation of frequency 10^(15)s^(-1) hits the metal.

    The threshold frequency v_(0) for a metal is 7.0xx10^(14)s^(-1) . Calculate the kinetic energy of an electron emitted when radiation of frequency v=1.0xx10^(15)s^(-1) hits the metal .

    The threshold frequency (v_(0)) for a metal is 5 xx 10^(14)S^(-1) . Calculate the kinetic energy of emitted electron when a radiation with frequency of 2 xx 10^(15) sec^(-1) hits the metal surface.

    The threshold frequency (V_(0)) for a metal is 5 xx 10^(14) S^(-1) .

    A wave has a frequency of 3 xx 10^(15) sec^(-1) . The energy of that photon is

    A wave has a frequency of 3 xx 10^(15) "sec"^(-1) . The energy of that photon is

    Home
    Profile