When light (or another wave) bounces back from a surface ?

1 answer:

3 0

Light bounces back due to the phenomenon called reflection. When light incidents on a plane shiny surface like mirror, it travels again in the same medium(medium from which light was incident) with no loss in energy(energy before and after reflection will remain same iff incident surface completely reflects light)

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the law of reflection states that if the angle of incidence is 77 degrees the angle of reflection is

zzz [600]

Answer: 77 degrees

Explanation:

According to the Law of Reflection, when a ray of light strikes a surface, the angle of this ray (incident ray) with respect to the normal of the surface is equal to the angle that forms the reflected ray with the same normal of the surface.

In other words:

Both the incident ray and the reflected ray and the normal to the surface are in the same plane, in addition, the angle of the incident ray is equal to the angle of the reflected ray.

In this context, if the angle of incidence is 77 degrees, the angle of reflection is 77 degrees, as well.

8 0

4 years ago

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force)

katen-ka-za [31]

Answer:

Velocity will be equal to 7.31 m/sec

Explanation:

We have given mass of the student m = 61 kg

Height of the water slide h = 12.3 m

Acceleration due to gravity $g=9.8m/sec^2$

Potential energy is equal to $U=mgh=61\times 9.8\times 12.3=7352.94J$

Work done due to friction = -5800 J

So energy remained = 7352.94-5800 = 1552.94 J

This energy will be equal to kinetic energy

So $\frac{1}{2}mv^2=1552.94$

$\frac{1}{2}\times 61\times v^2=1552.94$

$v^2=50.91$

v = 7.13 m/sec

7 0

3 years ago

A star with a parallax angle of 0.39" (arcsecond) is what distance away? Give your answer in units of parsecs.

postnew [5]

Answer:

2.56 parsec

Explanation:

Parallax angle is the angle subtended by Earth over a gap of 6 months in its orbital path around the Sun with respect to a star. It can be used to measure the distance to the star.

$d (parsec)=\frac{1}{p (arcsecond)}$