A glass plate 2.50 mm thick, with an index of refraction of 1.65, is placed between a point source of light with wavelength 600 nm (in vacuum) and a screen. The distance from source to screen is 1.35 cm . How many wavelengths are there between the source and the screen?

25208.33

Explanation:

Thickness of the glass plate 2.50mm = 2.50 × 10⁻³m

refractive index of the glass = 1.65

wavelength of the light in vaccum = 600nm

distance between source and screen = 1.35cm = 1.35 × 10⁻²m

wavelength of light in the medium

λ = 600 × 10⁻⁹ / 1.65

λ  = 3.6364 × 10⁻⁷

number of wavelength in glass

Distance travel by light in air

D = d - t

D = 1.35 × 10⁻² - 2.50 × 10⁻³

D = 0.011m

Thus, the number of wavelength

Total number of wavelength is

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

answer: b.

explanation: