Work function (W_0) values of six metals (in | vedclass

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(C) The energy of the incident radiation $(E)$ is calculated using the formula: $E = \frac{hc}{\lambda}$.Substituting the values: $E = \frac{6.62 	im

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$3$

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(C) The energy of the incident radiation $(E)$ is calculated using the formula: $E = \frac{hc}{\lambda}$.Substituting the values: $E = \frac{6.62 	imes 10^{-34} 	imes 3 	imes 10^8}{400 	imes 10^{-9} 	imes 1.6 	imes 10^{-19}} 	ext{ eV} \approx 3.1 	ext{ eV}$.For photoemission to occur,the energy of the incident radiation must be greater than or equal to the work function $(E \ge W_0)$.Conversely,electrons will not be ejected if the work function is greater than the incident energy $(W_0 > E)$.Comparing the given work functions with $3.1 	ext{ eV}$:$Mg (3.7 > 3.1)$,$Cu (4.8 > 3.1)$,and $Ag (4.3 > 3.1)$ have work functions greater than $3.1 	ext{ eV}$.Therefore,$3$ metals will not eject electrons.

List-$I$	List-$II$
$(1)$ $X$-rays	$(A)$ $\nu = 10^0 - 10^4 \ Hz$
$(2)$ Ultraviolet $(UV)$ rays	$(B)$ $\nu = 10^{10} \ Hz$
$(3)$ Long radio waves	$(C)$ $\nu = 10^{16} \ Hz$
$(4)$ Microwave	$(D)$ $\nu = 10^{18} \ Hz$

Work function $(W_0)$ values of six metals (in $eV$) are given below: $Li: 2.42, Mg: 3.7, Cu: 4.8, Ag: 4.3, K: 2.25, Na: 2.3$. How many of the above metals do not eject the electrons when they are made to strike with radiation of wavelength $400 \text{ nm}$? $(h = 6.62 \times 10^{-34} \text{ Js})$

Similar Questions

Match the following:

List-$I$ List-$II$

$(1)$ $X$-rays $(A)$ $\nu = 10^0 - 10^4 \ Hz$

$(2)$ Ultraviolet $(UV)$ rays $(B)$ $\nu = 10^{10} \ Hz$

$(3)$ Long radio waves $(C)$ $\nu = 10^{16} \ Hz$

$(4)$ Microwave $(D)$ $\nu = 10^{18} \ Hz$

Assuming that the incident radiation is capable of ejecting photoelectrons from all the given metals,the lowest kinetic energy of the ejected photoelectron is observed with which of the given metals?

The energy of an electromagnetic radiation is $19.875 \times 10^{-13} \ erg$. What is its wave number in $cm^{-1}$? $(h = 6.625 \times 10^{-27} \ erg \ sec, c = 3 \times 10^{10} \ cm \ sec^{-1})$

What is the wavelength for a wave having frequency $50 \ Hz$?

Consider two radiations of wavelengths $1. \lambda_1 = 2000 \mathring{A}$ and $2. \lambda_2 = 6000 \mathring{A}$. The ratio of the energies of these two radiations $\left(\frac{E_1}{E_2}\right)$ is . . . . . . (Nearest integer).

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