Question

The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is:

A. one-fourth the energy of a photon in beam B
B. half the energy of photon in beam B
C. equal to the energy of a photon in beam B
D. twice energy of a photon in beam B four times the energy of a photon in beam B

Answer 1

Corrected question: The wavelength of light beam A is twice the wavelength of light beam B. The energy of a photon in beam A is:

Answer:

B

Explanation:

Energy = hc/λ

λ(A) =2λ(B)...................equation 1

We will solve for the ratio of energy of A to energy of B.which is

$\frac{E_{A} }{E_{B} }$

=(hc/λA) ÷ (hc/λB)

referring to equation 1 we have

=(hc/2λB) ÷ (hc/λB)

=hc/2λB) × (λB/hc)

= λB/2λB

$\frac{E_{A} }{E_{B} }$=1/2

${E_{A} = \frac{1}{2} E_{B}$

The energy of A is half of B