Question

What is the energy of a wave with a wavelength of 7.43 x 10-⁵?

A.6.32 x 10-²¹ J
B.2.68 x 10-²¹ J
C.2.68 x 10-²⁰ J
D.5.47 x 10-²¹ J

Answer 1

The energy of a wave with a wavelength of 7.43 x 10^-5 m is 2.82 x 10^-19 J.

Step-by-step explanation:

The energy of a wave can be calculated using the equation E = hc/λ, where E is the energy of the wave, h is Planck's constant (6.626 x 10^-34 J•s), c is the speed of light (3 x 10^8 m/s), and λ is the wavelength of the wave. To find the energy of a wave with a wavelength of 7.43 x 10^-5 m, we can substitute the values into the equation:

E = (6.626 x 10^-34 J•s) (3 x 10^8 m/s) / (7.43 x 10^-5 m)

Simplifying this equation gives:

E = 2.82 x 10^-19 J

Therefore, the correct answer is A. 2.82 x 10^-19 J.