An electron moves from an energy level of -8.6 eV to anot...
An electron moves from an energy level of -8.6 eV to another level of -3.5 eV. Determine the frequency of the absorbed radiation. [1 eV = 1.6 × 1019 J, h = 6.6 × 1034 Js]
2.93×1015Hz
3.59×1016Hz
5.39×1015Hz
1.24×1015Hz
Correct answer is D
h = 6.6×10−34Js, 1eV = 1.6×10−19J, E1 = - 8.6eV, E2 = - 3.5eV, f = ?
ΔE = hf
f = \frac{ΔE}{h}
ΔE = E_2 - E_1 = - 3.5eV - (- 8.6eV) = 5.1eV
but 5.1eV = 5.1 X 1.6 \times 10^{-19} = 8.16 \times 10^{-19}J
f = \frac{8.16 \times 10^{-19}}{ 6.6 \times 10^{-34}}
Therefore, f = 1.24 \times 10^{15}Hz
Which of the following statements is Not true about atoms? ...
Ripples on water and light waves are similar because both? ...
A freshly demagnetized bar magnet is placed in the East-West direction to ensure that ...
The product of force and time is? ...
The velocities of light in air and glass are 3.0 x 10^8ms^{-1} and 2.0 x 10^8ms^{-1}...
An object is placed between two mirrors which are inclined at an angle of 120° and facing each o...
If the refractive index of crown glass is 1.51, its critical angle is?...