(a) 
The frequency of an electromagnetic wave is given by:

where
is the speed of the wave in a vacuum (speed of light)
is the wavelength
In this problem, we have laser light with wavelength
. Substituting into the formula, we find its frequency:

(b) 427.6 nm
The wavelength of an electromagnetic wave in a medium is given by:

where
is the original wavelength in a vacuum (approximately equal to that in air)
is the index of refraction of the medium
In this problem, we have

n = 1.48 (index of refraction of glass)
Substituting into the formula,

(c) 
The speed of an electromagnetic wave in a medium is

where c is the speed of light in a vacuum and n is the refractive index of the medium.
Since in this problem n=1.48, we find

Answer:
1) 20 m/s
2) 60 meters
Explanation:
with a constant acceleration of 4m/s/s, the vehicle will end up traveling at 20 m/s after 5 seconds, and will have travelled 60 meters.
Neutrons < Cosmic radiation < Gamma rays < beta particles < Alpha particles
Explanation:
Alpha particles are the most energetic of the nuclear radiations produced in nuclear reactions.
Neutrons are radiations with no charges on them. They are the lowest radiation in terms of energy.
Cosmic radiation are energetic radiations usually produced when solar radiation interacts with the atmosphere.
Gamma ray is a form of electromagnetic radiation with no mass and charge.
Beta particles are of two types. The negative and positive beta particles. Negative beta particles are called negatrons and they carry negative charges while positrons carry positive charges.
Alpha particles are similar to Helium atom,they are the most energetic of all the radiations.
Learn more:
Radiation brainly.com/question/9077368
#learnwithBrainly
S = ?
U = 0
V = ?
A = 9.81
T = 2
we tryna find s
lets use s = ut + (at^2)/2
ut cancels out since u = 0
(at^2)/2 = (9.81 x 2^2)/2
= 19.62m