Advertisements
Advertisements
Question
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 ______
Options
3.2 × 10-21
3.2 × 10-19
3.2 × 10-1
3.2 × 10-15
Advertisements
Solution
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 3.2 × 10-19.
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 ______.
Choose the correct option.
The equation E = pc is valid ______.
The work function of a metal is 4.2 eV. Its threshold wavelength will be ______.
Calculate the stopping potential when the metal with the work function 0.6 eV is illuminated with the light of 2 eV.
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?
Who discovered cathode rays in 1870?
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?
What is the presently accepted value of the specific charge \[e/m\] for cathode ray particles?
How did the value of \[e/m\] depend on the gas introduced in the discharge tube?
What happened when certain metals were irradiated with ultraviolet light, as found in 1887?
Who named these particles electrons in 1897?
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 did Millikan find about the charge on an oil droplet?
What value was measured for the elementary charge?
