NAME: _________________________________________ 10 - ______________________________SCORE: ______________
QUIZ NO. 1
SOLVING FREQUENCY, ENERGY AND WAVELENGTH
Solve the following problems using GRESA.
1. Violet light has a wavelength of 2. Green light has a frequency of 6.01 x 1014
-12
4.0 x 10 m. What is the frequency? Hz. What is the wavelength?
3. What is the frequency of a wave carrying 4. What is the energy of a spectral line
8.4 x 10-18 J of energy? having frequency of 7.2 x 1014 Hz?
5. Calculate the energy of a photon with a 6. Calculate the energy of a photon of
wavelength of 400 m. radiation with a wavelength of 6.4 x 10-7 m
For problems that involve wavelength and frequency
Formula 1: 𝐶=𝜆𝑓
EVT2023
( 𝐶 ) is the wave speed or speed of light (3×10^8 𝑚∕𝑠) expressed in meters per second
wherein:
( 𝑓 ) is the frequency, expressed in Hertz (Hz)
(m/s)
( 𝜆 ) is the wavelength, expressed in meters (m)
Constants:
c = 3×10^8 𝑚∕𝑠
Speed of an EM waves in vacuum
For problems that involve energy and frequency
Formula 2: E=ℎf
wherein:
( ℎ ) = Planck’s constant (6.63×10^(−34) 𝐽∙𝑠 )
( E ) = energy in Joule (J)
( 𝑓 ) = frequency in hertz (Hz)
For problems that involve energy and wavelength
Formula 3: 𝐸=𝒉𝒄/𝜆
wherein:
( ℎ ) = Planck’s constant (6.63×10^(−34) 𝐽∙𝑠 )
( E ) = energy in Joule (J)
( 𝐶 ) = Speed of light in vacuum (3×10^8 𝑚∕𝑠)
( 𝜆 ) = wavelength in meters (m)
QUIZ # 1
A. Write True if the statement is correct; False if it is not.
______1. James Clark Maxwell is the father of electromagnetic waves.
______2, Hans Christian Ørsted is the one who proves Maxwell’s equation.
______3. Electromagnetic waves are longitudinal in nature.
______4. Electromagnetic wave’s intensity can be determined by its amplitude.
______5. Electromagnetic waves can be used in the field of medicine.
B. Choose the letter of the correct answer. Write the letter of your answer on the left side of your notebook.
______1. What happens to the frequency of a wave when its wavelength is doubled?
a. Doubled b. halved c. tripled d. unchanged
______2. Which of the following colors of light consists of the longest wavelength?
a. Red b. blue c. yellow d. violet
______3. Why do gamma rays have the greatest penetrating energy?
a. because they have the lowest frequency
b. because they have the longest wavelength
c. because they have the highest frequency
d. because they have longer wavelengths than x-rays
______4. Which of the following is INCORRECT?
a. The radio waves have the longest wavelength in EM spectrum.
b. Electromagnetic waves have both an electric and a magnetic component.
c. Speed of EM waves depends on the medium they are passing through.
d. The electromagnetic waves are a longitudinal wave that propagate outward from a source perpendicular to the
direction of the wave’s travel.
______5. Which of the following is INCORRECT?
a. The longer the wavelength of the EM wave the Higher its frequency
b. The longer the wavelength of the EM wave the lower its frequency
c. The longer the wavelength of the EM wave the lower its energy
d. The shorter the wavelength of the EM wave the Higher its frequency.
EVT2023
