Frequency is measured in hertz. Which option best describes hertz?(1 point)
Responses
the distance that one cycle of a wave will travel
the distance that one cycle of a wave will travel
the number of waves that pass a certain point within a certain time
the number of waves that pass a certain point within a certain time
the number of vibrations produced per minute
the number of vibrations produced per minute
the length of a wave over a specified length of time
The second option, "the number of waves that pass a certain point within a certain time," best describes hertz.
Use the information about four different waves to answer the question.
Wave # Frequency Wavelength
Wave 1 6.66 × 1014 Hz 450 nm
Wave 2 5.77 × 1014 Hz 520 nm
Wave 3 4.61 × 1014 Hz 650 nm
Wave 4 4.28 × 1014 Hz 700 nm
Which wave contains the lowest energy?
(1 point)
Responses
wave 2
wave 2
wave 4
wave 4
wave 3
wave 3
wave 1
The wave with the lowest energy is wave 4.
Use the image of the electromagnetic spectrum to answer the question.
The illustration describes the different wavelengths in decreasing order and the frequency in increasing order from left to right. The radiations shown are as follows: the radio waves (AM, FM, TV, and radar), wavelength from 100 m to 1 cm. Infrared (TV remote), wavelength from 1 cm to 1000 nm. Visible spectrum (light bulb) wavelength from 1000 nm to 10 nm. X-rays (X-ray machine) wavelength from 10 nm to 0.01 nm. Gamma rays (radioactive elements) wavelength from 0.01 nm to 0.0001 nm.
Lightning contains gamma rays. Based on the position of gamma rays in the electromagnetic spectrum, does lightning have more or less energy than a radio?
(1 point)
Responses
Lightning has more energy than the radio because gamma rays have a shorter wavelength.
Lightning has more energy than the radio because gamma rays have a shorter wavelength.
Lightning has more energy than the radio because gamma rays have a longer wavelength.
Lightning has more energy than the radio because gamma rays have a longer wavelength.
Lightning has less energy than the radio because gamma rays have a longer wavelength.
Lightning has less energy than the radio because gamma rays have a longer wavelength.
Lightning has less energy than the radio because gamma rays have a shorter wavelength.
Lightning has more energy than the radio because gamma rays have a shorter wavelength.
Waves have energy that causes particles in matter to vibrate. So, it stands to reason that(1 point)
Responses
the higher the energy, the slower the particles vibrate (which means a lower frequency).
the higher the energy, the slower the particles vibrate (which means a lower frequency).
the lower the energy, the slower the particles vibrate (which means a higher frequency).
the lower the energy, the slower the particles vibrate (which means a higher frequency).
the lower the energy, the faster the particles vibrate (which means a lower frequency).
the lower the energy, the faster the particles vibrate (which means a lower frequency).
the higher the energy, the faster the particles vibrate (which means a higher frequency).
The higher the energy, the faster the particles vibrate (which means a higher frequency).
When white light strikes this object, the light is completely absorbed, with none of it transmitted or reflected. Which type of object could this be?(1 point)
Responses
a clear windowpane
a clear windowpane
a white sheet of plastic
a white sheet of plastic
a black piece of paper
a black piece of paper
a green long-sleeved shirt
A black piece of paper could be the type of object that completely absorbs white light without transmitting or reflecting it.
Which property causes a pencil to appear bent or broken when it is placed in a glass partially filled with water?(1 point)
Responses
Absorption
Absorption
Refraction
Refraction
Normal
Normal
Reflection