I would say A classical conditioning definitely demands a pairing of two stimuli
hope i helped
Lots of people worldwide still do use the lunar calendar. Actually, before the romans came, the ancients used the lunar calendar. We don't use it anymore because it isn't useful. We prefer months of equal days, which is not the lunar calendar.
The frequency of a photon with an energy of 4.56 x 10⁻¹⁹ J is 6.88×10¹⁴ s⁻¹.
<h3>What is a frequency?</h3>
The number of waves that travel through a particular point in a given length of time is described by frequency. So, if a wave takes half a second to pass, the frequency is 2 per second.
Given that the energy of the photon is 4.56 x 10⁻¹⁹ J. Therefore, the frequency of the photon can be written as,

Hence, the frequency of a photon with an energy of 4.56 x 10⁻¹⁹ J is 6.88×10¹⁴ s⁻¹.
Learn more about Frequency:
brainly.com/question/5102661
#SPJ4