When a light of wavelength 'lambda' falls on | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) आइंस्टीन के प्रकाश-विद्युत समीकरण के अनुसार: $K_{max} = \frac{1}{2}mV^2 = \frac{hc}{\lambda} - \phi$, जहाँ $\phi$ कार्य फलन है।प्रथम स्थिति में: $

Vedclass · Accepted Answer

greater than $V(1.5)^{1/2}$

Vedclass · Answer

(B) आइंस्टीन के प्रकाश-विद्युत समीकरण के अनुसार: $K_{max} = \frac{1}{2}mV^2 = \frac{hc}{\lambda} - \phi$, जहाँ $\phi$ कार्य फलन है।प्रथम स्थिति में: $\frac{1}{2}mV^2 = \frac{hc}{\lambda} - \phi$ ... $(1)$दूसरी स्थिति में, नई तरंगदैर्ध्य $\lambda' = \frac{2\lambda}{3}$ है। मान लीजिए नई अधिकतम गति $V'$ है।$\frac{1}{2}m(V')^2 = \frac{hc}{2\lambda/3} - \phi = \frac{3hc}{2\lambda} - \phi = 1.5 \frac{hc}{\lambda} - \phi$समीकरण $(1)$ से, $\frac{hc}{\lambda} = \frac{1}{2}mV^2 + \phi$अतः, $\frac{1}{2}m(V')^2 = 1.5(\frac{1}{2}mV^2 + \phi) - \phi = 0.75mV^2 + 1.5\phi - \phi = 0.75mV^2 + 0.5\phi$$\frac{1}{2}m(V')^2 = 0.75mV^2 + 0.5\phi$$(V')^2 = 1.5V^2 + \frac{\phi}{m}$$(V')^2 > 1.5V^2$$V' > V(1.5)^{1/2}$अतः, नई अधिकतम गति $V(1.5)^{1/2}$ से अधिक होगी।

When a light of wavelength '$\lambda$' falls on the emitter of a photosensitive surface, the maximum speed of emitted photoelectrons is '$V$'. If the incident wavelength is changed to '$2\lambda/3$',the maximum speed of emitted photoelectrons will be

Similar Questions

When photons of energy $1 \ eV$ and $2.5 \ eV$ are incident on a metal surface with a work function of $0.5 \ eV$,what is the ratio of the maximum kinetic energies of the emitted photoelectrons?

The maximum velocity of an electron emitted by light of wavelength $\lambda$ incident on the surface of a metal of work function $\phi$ is [$h=$ Planck's constant,$m=$ mass of electron and $c=$ speed of light]

In a photoelectric experiment,light of energy $2.48 eV$ irradiates a photosensitive material. The stopping potential was measured to be $0.5 V$. The work function of the photosensitive material is: (in $eV$)

The work function of a substance is $4.0 \,eV$. The longest wavelength of light that can cause photoelectron emission from this substance is approximately ......... $nm$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module