Answer:
B
Explanation:
i think leter B it because
The emission of the light waves ..................... which means that THE TROUGHS OF ONE WAVE AND THE CREST OF ANOTHER overlap.
When the trough and the crest of wave overlap, it results in constructive interference and the amplitude of the two waves are added together to form a larger amplitude.<span />
Answer:
2.281*10^28 photons
Explanation:
Data
- Volume of coffee, V = 245 mL
- Temperature change of the coffee, ΔT = 62 - 25 = 37 °C
- Density of coffee, D = 0.997 g/mL
- Specific heat capacity of coffee, cp = 4.184 J/(g*K) = 4.184 J/(g* °C)
- wavelength of the microwave radiation, λ = 12 cm = 0.12 m
Mass of the coffee
m = D*V = 0.997 * 245 = 244.265 g
Energy (heat) absorbed by the coffee
Q = m*cp*ΔT = 244.265 * 4.184 * 37 = 37814.1761 J
Energy of the photon
E = h*c/λ
where h is the Planck constant ( 6.63 x 10^(-34) J*s) and c is the speed of light at vacuum (3*10^8 m/s)
E = 6.63 x 10^(-34)*3*10^8/0.12 = 1.6575*10^(-24) J
number of photons required = total energy required / energy per photon
n = 37814.1761/1.6575*10^(-24) = 2.281*10^28 photons