Question

Which of the following is equivalent to Planks constant (h = 6.63 × 10-34J · s)?

A. h = 4.14 × 10-15eV · s

B. h = 4.14 × 10-15J · s

C. h = 1.06 × 10-52eV · s

D. h = 1.06 × 10-52J · s

Answer 1

The correct answer is option A.

Step-by-step explanation:

The Planck's constant is defines ratio of an energy of quantum of an electromagnetic radiation to frequency of the electromagnetic radiation.The units of the constant is J.s (Joule seconds).

The Planck's equation is given as

`E=h\\u=(h* c)/(\lambda)`

where,

E = energy of photon = ?

h = Planck's constant =
`6.63* 10^(-34)Js`

c = speed of light =
`3* 10^8m/s`

`1 J=6.242* 10^(18) eV`

`h = 6.63* 10^(-34)Js=6.63* 10^(-34)* 6.242* 10^(18) eV.s`

`=4.138* 10^(-15) eV.s\approx 4.14* 10^(-15) eV.s`

Hence, the correct answer is option A.