Advertisements
Advertisements
Question
Calculate the stopping potential when the metal with the work function 0.6 eV is illuminated with the light of 2 eV.
Advertisements
Solution
Given: φ0 = 0.6 eV, E = 2 eV
To find: Stopping potential (V0)
Formula: V0 = `("E" - phi_0)/"e"`
Calculation:
V0 = `(2 xx 1.6 xx 10^-19 - 0.6 xx 1.6 xx 10^-1)/(1.6 xx 10^-19)`
= 2 - 0.6
= 1.4 V
The stopping potential is 1.4 V.
APPEARS IN
RELATED QUESTIONS
A photocell is used to automatically switch on the street lights in the evening when the sunlight is low in intensity. Thus it has to work with visible light. The material of the cathode of the photocell is ______.
If NRed and NBlue are the numbers of photons emitted by the respective sources of equal power and equal dimensions in unit time, then ______.
Ultraviolet radiation of 6.2 eV falls on an aluminum surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is ______
What is cut-off or stopping potential?
What is mean by the dual nature of matter?
In what year did Hertz perform experiments on the generation and detection of electromagnetic waves?
Which experiments led to important discoveries in atomic structure?
At what pressure did discharge occur between the two electrodes when an electric field was applied to the gas in the discharge tube?
Where did a fluorescent glow appear during electric discharge through low-pressure gas?
What determined the colour of the fluorescent glow, and what colour was observed for soda glass?
What were the rays attributed to radiation originating from the cathode called?
Which British physicist confirmed that cathode rays consisted of fast-moving negatively charged particles?
What did Thomson apply across the discharge tube to determine the speed and specific charge of cathode ray particles?
What value is given for the speed of light?
How did the value of \[e/m\] depend on the gas introduced in the discharge tube?
What did the independence of \[e/m\] from cathode material and gas suggest?
What happened when certain metals were irradiated with ultraviolet light, as found in 1887?
What did J. J. Thomson suggest about electrons in 1897?
Who performed the oil-drop experiment in 1913 for the precise measurement of the charge on an electron?
What value was measured for the elementary charge?
What did Millikan’s oil-drop experiment establish?
Which measured values could be used to determine the mass \[m\] of the electron?
