In a physics lab, light with wavelength 490 nm travels in air from a laser to a photocell in 17.0 ns. when a slab of glass 0.840 m thick is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light 21.2 ns to travel from the laser to the photocell. what is the wavelength of the light in the glass?

196 nm

Explanation:

Given

wavelength

time required by laser to travel in air

slab thickness

time requires by laser to travel

so it takes more in glass slab

suppose n is the refractive index of glass

n-1=1.5

n=2.5

Wavelength of light in Glass

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.