When a metal surface is exposed to a certain frequency of electromagnetic radiation,the kinetic energy of the electron ejected from the metal surface is $0.20 \ eV$. If its work function $(W_0)$ is $4.80 \ eV$,the approximate frequency of the radiation falling on the metal surface in $Hz$ is:
- A$1.98 \times 10^{15}$
- B$1.21 \times 10^{16}$
- C$1.21 \times 10^{15}$
- D$1.98 \times 10^{16}$
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The longest wavelength of light that can be used for the ionisation of lithium atom $(Li)$ in its ground state is $x \times 10^{-8} \, m$. The value of $x$ is $.....$ (Nearest Integer)
(Given : Energy of the electron in the first shell of the hydrogen atom is $-2.2 \times 10^{-18} \, J$; $h = 6.63 \times 10^{-34} \, Js$ and $c = 3 \times 10^{8} \, ms^{-1}$ )
(Given : Energy of the electron in the first shell of the hydrogen atom is $-2.2 \times 10^{-18} \, J$; $h = 6.63 \times 10^{-34} \, Js$ and $c = 3 \times 10^{8} \, ms^{-1}$ )
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is = ....... (Bohr radius $a_0$)
Difficult
View SolutionValues of work function $(W_0)$ for a few metals are given below:
Metal $Li$ $Na$ $K$ $Mg$ $Cu$ $Ag$ $W_0 / eV$ $2.42$ $2.3$ $2.25$ $3.7$ $4.8$ $4.3$
The number of metals which will show photoelectric effect when light of wavelength $400 \ nm$ falls on it is $........$.
Given: $h = 6.6 \times 10^{-34} \ J \ s$,$c = 3 \times 10^8 \ m \ s^{-1}$,$e = 1.6 \times 10^{-19} \ C$
| Metal | $Li$ | $Na$ | $K$ | $Mg$ | $Cu$ | $Ag$ |
| $W_0 / eV$ | $2.42$ | $2.3$ | $2.25$ | $3.7$ | $4.8$ | $4.3$ |
The number of metals which will show photoelectric effect when light of wavelength $400 \ nm$ falls on it is $........$.
Given: $h = 6.6 \times 10^{-34} \ J \ s$,$c = 3 \times 10^8 \ m \ s^{-1}$,$e = 1.6 \times 10^{-19} \ C$
If the velocity of an electron in the $n^{th}$ orbit of a Bohr atom is $v$,what is the value of $n$?
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View SolutionThe work function of a metal is $4.2 \, eV$. If radiation of $2000 \, \mathring{A}$ falls on the metal,then the kinetic energy of the fastest photoelectron is:
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