What is the Frequency?

Question

Question #1 Violet light has a wavelength of 4.10 x 10-12 m. What is the frequency?

 

 

Question #2 Calculate the energy of a gamma ray photon whose frequency is 5.02 x 1020 Hz?

 

Question #3 What is the wavelength (in meters) of the electromagnetic carrier wave transmitted by The Sports Fan radio station at a frequency of 640. kHz (6.40 x 105 Hz)?

 

?A sodium vapor lamp emits light photons with a wavelength of 5.89 x 10-7 m. What is the energy of these photons?

 

Question #5 What is the frequency of UV light that has energy of 2.39 x 10-18 J?

 

 

Question #6 A helium laser emits light with a wavelength of 633 nm (6.33 x 10-6m). What is the frequency of the light?

Answer 1

Q1:

 

f = c/λ = (3.00 × 10⁸ m/s) / (4.10 × 10^-12 m) = 7.32 × 10¹⁹ Hz.

 

Q2:

 

E = hf = (6.63 × 10^-34 J·s)(5.02 × 10²⁰ Hz) = 3.33 × 10^-13 J

 

Q3:

 

λ = c/f = (3.00 × 10⁸ m/s) / (6.40 × 10⁵ Hz) = 4.69 × 10² m

 

Q4:

 

E = hc/λ = (6.63 × 10^-34 J·s)(3.00 × 10⁸ m/s) / (5.89 × 10^-7 m) = 3.38 × 10^-19 J

 

Q5:

 

f = E/h = (2.39 × 10^-18 J) / (6.63 × 10^-34 J·s) = 3.60 × 10¹⁵ Hz

 

Q6:

 

f = c/λ = (3.00 × 10⁸ m/s) / (6.33 × 10^-6 m) = 4.74 × 10¹³ Hz