Question

Which of the following is the correct formula for one Einstein?
(A) Nc/λ
(B) hc/λ
(C) Nhc/λ
(D) Nh/λc

Answer 1

Answer:

Answer option B is correct

Explanation:

E = hν is the formula

as we know that c= νλ

so  ν=c/λ

E= hc/λ

so option b is correct

Answer 2

Answer:

The correct formula is (B) hc/λ

Explanation:

To determine the formula for one Einstein, we can use the Planck-Einstein relation which is:

$E=h \nu$

Where,

h = Planck’s constant

$\nu$ = Frequency of the wave (this formula is mostly used in quantum mechanics)

Now, the formula of the frequency is:

$\nu=\frac{c}{\lambda}$

Where,

c = Speed of light

$\lambda$ = Wavelength of light

On substituting the formula of frequency in Planck-Einstein relationship,

$\therefore E=\frac{h c}{\lambda}$