Question

Please help due in 5 min. I need this to be done or my grade will drop from a 96 to a 32.

Calculate the energy and frequency of red light having a wavelength of 6.55 x 10^-5 cm.

Answer 1

Step-by-step explanation:

speed of light = wavelength * frequency

frequency =speed of light/wavelength

Let frequency = F

Speed of light = 3.0 *10^8

wavelength = 6.55 * 10^-5 cm = 6.55 * 10^-7m

Therefore F= 3.0 *10^8m/s *6.55 * 10^-7m

F = 196.5Hz

Energy = Planck's constant * frequency

Let energy be E

Planck's constant = 6.63 * 10^-34Joule/ seconds

E = 6.63 * 10^-34 * 196.5Hz

E=1.3027 * 10^-31 J

Answer 2

E = 3.035× 10-¹⁹J = 1.9eV

f = 4.58 × 10¹⁴Hz

Step-by-step explanation:

wavelength = 6.55 × 10-⁷m

c = 3 × 10⁸m/s

f = ?

E = ?

a) f = c/wavelength

f = 3 × 10⁸/6.55 × 10-⁷

f = 4.58 × 10¹⁴Hz

b) E = hc/wavelength

E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷

E = 3.035 × 10-¹⁹J

1ev = 1.6 × 10-¹⁹J

Therefore E = 3.035/1.6 = 1.9eV