A diffraction grating 19.2 mm wide has 6010 rulings. Light of wavelength 337 nm is incident perpendicularly on the grating. What are the (a) largest, (b) second largest, and (c) third largest values of θ at which maxima appear on a distant viewing screen?

(a). The largest value of θ is 71.9°.

(b). The second largest value of θ is 57.7°.

(c). The third largest value of θ is 47.7° .

Explanation:

Given that,

Width of diffraction grating

Number of rulings

Wavelength = 337 nm

We need to calculate the distance between adjacent rulings

Using formula of distance

Put the value into the formula

We need to calculate the value of m

Using formula of constructive interference

Here, m = 0,1,2,3,4......

=wavelength

For largest value of  θ

Put the value into the formula

(a). We need to calculate the largest value of θ

Using formula of constructive interference

Now, put the value of m in to the formula

(b). We need to calculate the second largest value of θ

Using formula of constructive interference

Now, put the value of m in to the formula

(c). We need to calculate the third largest value of θ

Using formula of constructive interference

Now, put the value of m in to the formula

Hence, (a). The largest value of θ is 71.9°.

(b). The second largest value of θ is 57.7°.

(c). The third largest value of θ is 47.7° .

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it