Question

An ultraviolet photon has energy of 6.63x10^-19 J. Find the wavelength of the UV light. Use E=hc/λ with h= 6.63 x 10^-34 J sec and c=3x10⁸ m/s. What are some appliances/equipment that use the uv light?

Answer 1

here,

let the wavelength of UV ray be lamda

the energy of UV ray , E = h * c /lamda

6.63 * 10^-19 = 6.62 * 10^-34 * 3 * 10^8 /lamda

lamda = 2.99 * 10^-7 m

the wavelength of UV ray is 2.99 * 10^-7 m

the appliances that use the UV light :

a)

Many hospitals safely and easily use UV lamps for sterilizing surgical equipment as well as the air in operating rooms.

b)

UV lamps also provide a safe, efficient way to treat water without the need to use harmful chemicals that create pollution in rivers