The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?
A. 1.48ev B. 2.21ev C. 4.42ev D. 5.75ev E. 11.51ev Correct Answer: Option B = 2.21ev Explanation K.E = ½mv² E – W = 6.86 – 4.65 = 2.21ev
The half-life of a radioactive substance is 2 seconds. Calculate the decay constant?
A. 0.035s−¹ B. 0.151s−¹ C. 0.347s−¹ D. 0.576s−¹ E. 1.386s−¹ Correct Answer: Option C – 0.347s−¹ Explanation λ=0.693/T½ = 0.6932 = 0.347s−¹
When a metal surface is irradiated, photoelectrons may be ejected from the metal. The kinetic energy of the ejected electrons depends on the?
A. source of the radiation B. intensity of the radiation C. detection device for the electrons D. amplitude of the radiation E. frequency of the radiation Correct Answer: Option E – frequency of the radiationCalculate the height of the plane above the ground?
Plane as 63cm of HG while a ground observer records a reading of 75cm of Hg with his barometer. assuming that the density of air is constant, calculate the height of the plane above the ground. (Take the relative densities of air and mercury as 0.00136 and 13.6...
Which of the following statements is not correct? Isotopes of an element have?
A. the same number of electric charges on the nucleus B. the same chemical properties C. different nucleon numbers D. different proton numbers E. different atomic masses Correct Answer: Option D – different proton...Products
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