Question

calculate the wavelength of a photon of energy 5ev​

Answer 1

Answer:

2.47 × 10 ^-5 cm

is the answer

Answer 2

• Energy=E=5eV
• Frequency=v=?

we know

$\boxed{\sf E=hv}$

$\\ \sf\longmapsto v=\dfrac{E}{h}$

$\\ \sf\longmapsto v=\dfrac{5eV}{6.626\times 10^{-34}Js}$

$\\ \sf\longmapsto v=\dfrac{5(1.6\times 10^{-19}J)}{6.626\times 10^{-34}Js}$

$\\ \sf\longmapsto v=\dfrac{8\times 10^{-19}J}{6.626\times 10^{-34}Js}$

$\\ \sf\longmapsto v=1.2\times 10^{15}s^{-1}$