The energy of a photo having a wavelength of 10-10m is
(h= 6.63 x 10 -34Js, c =3.0 x 10 8ms-1)
2.0 x 10 -15J
1.7 x 10 -13J
2.0 x 10 -12J
1.7 x 10 -12J
Correct answer is A
E = hcλ
E = 6.63×10−34×3×101810−10
E = 2 x 10-15J
The particle nature of light is demonstrated by the
photoelectric effect
speed of light
colours of light
diffraction of light
Correct answer is A
No explanation has been provided for this answer.
In photo-emission, the number of photo-electrons ejected per second depends on the?
frequency of the beam
work function of the metal
threshold frequency of the metal
intensity of the beam
Correct answer is D
The photoelectric effect is dependent upon various factors including frequency of light, intensity of light, nature of material, energy of light and potential difference.
Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV
-9.20eV
-8.20eV
-2.75eV
-1.75eV
Correct answer is C
E3=En2
E3=−24.832
E3=2.75eV