Two of the types of infrared light, ir-c and ir-a, are both components of sunlight. their wavelengths range from 3000 to 1,000,000 nm for ir-c and from 700 to 1400 nm for ir-
a. compare the energy of microwaves, ir-c, and ir-
a.

The energy of electromagnetic waves can be calculated by using the following formula:

where:

is the Planck constant

is the speed of light

is the wavelength of the wave

Substituting the various wavelengths in the formula, we find:

IR-C:

-->

-->

IR-A:

-->

-->

Therefore, we see that IR-A have higher energy than IR-C.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000