The wavelength of light visible to the human
eye is on the order of 7 × 10^−7 m.
Find the frequency of the lightwave if the
speed of light in air is 2.99792 × 10^8 m/s.
Answer in units of s^−1
.

4.2817 × 10^14 s^-1

Explanation:

The term "wave speed" is described as the distance covered by a wave in specific time duration. The wave speed (v) can be mathematically expressed as:

v=fλ

Where;

F= frequency which is the number of waves that pass a fixed point per unit time and it is also the number of cycles or vibrations undergone during pet unit of time by a body in periodic motion

λ= wavelength which is the distance between successive crests of a wave.

Given the data,

Wavelength λ= 7×10^-7m

Speed of light c= 2.99792 × 10^8 m/s

Frequency of visible light can be given as:

Frequency= speed of light/wavelength

Frequency = (2.99792 × 10^8 m/s) / (7×10^-7m)

Frequency= 4.2817 × 10^14 s^-1

Therefore, the frequency of the light wave is 4.2817 × 10^14 s^-1

this could be newton#'s law of cooling. the cooling curve is exponential

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.