Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • The threshold frequency for a certain metal is  . When light of frequency <img alt="\nu =2\nu _{0}"

The threshold frequency for a certain metal is \nu _{0} . When light of frequency \nu =2\nu _{0} is incident on it, the maximum velocity of photoelectrons is 4\times 10^{6}m/s. If the frequency of incident radiations is increased to 5\nu _{0} , then the maximum velocity of photoelectrons in m/s will be -

Option: 1

\frac{4}{5}\times 10^{6}


Option: 2

2\times10^{6}


Option: 3

8\times10^{6}


Option: 4

2\times10^{6}


Answers (1)

best_answer

\begin{aligned} & \mathrm{v}_{\max .}=\sqrt{\frac{2}{\mathrm{~m}}\left(\mathrm{E}_{\mathrm{Ph}}-\mathrm{W}\right)}=\sqrt{\frac{2}{\mathrm{~m}}\left(\mathrm{hv}-\mathrm{h} \mathrm{v}_0\right)} \\ & \left(\mathrm{v}_{\max .}\right)_1=\sqrt{\frac{2 \mathrm{~h}}{\mathrm{~m}}\left(2 \mathrm{v}_0-\mathrm{v}_0\right)} \\ & \left(\mathrm{v}_{\max }\right)_2=\sqrt{\frac{2 \mathrm{~h}}{\mathrm{~m}}\left(5 \mathrm{v}_0-\mathrm{v}_0\right)} \\ & \frac{\mathrm{v}_{\max _{.2}}}{\mathrm{v}_{\max _{.1}}}=2 \Rightarrow \mathrm{v}_{\max _{2}}=2 \mathrm{v}_{\max _{\cdot 1}} \\ & \mathrm{v}_{\max _{.2}}=2 \times 4 \times 10^6=8 \times 10^6 \mathrm{~m} / \mathrm{s} \end{aligned}

Posted by

rishi.raj

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

'PM Modi personally supervising the situation': Centre tells SC in NEET case
anam-khan

NEET Paper Leak Row: NTA informs SC of security overhaul, institutional reforms
anam-khan

Re-NEET 2026 City Intimation Slip LIVE: NTA MBBS admit card soon; direct link, login details, exam date

Latest Question