Consider light from a laser that has wavelength of 632.8 nm in air. As the light travels from the air into Lucite (index of refraction 1.50) calculate its (a) frequency in air, (b) wavelength in Lucite and (c) speed in Lucite. Put all three answers labeled with (a), (b) and (c) in the box below.

Solution of each part is given below .                                                     

Explanation:

Given :

Wavelength of laser in air is , .

We know its velocity in air is , .

So , its frequency is ,

We know , frequency is source dependent only and since the source is same so frequency will be same and equal to .

Therefore , its velocity in Lucite is :

New wavelength is :

Hence , this is the required solution .

their crystal patterns have been disrupted by stress

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.