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Misha Larkins [42]

4 years ago

14

Reflection is the bouncing of light rays off of a surface. Which situation is NOT an example of reflection?

2 answers:

galina1969 [7]4 years ago

7 0

Answer: b.focusing light through a camera lens

Explanation:

Reflection is an optical phenomenon in which light bounces off an opaque surface on which it falls.

A mirror is formed of glass which has highly lustrous metal coated at the back. The light bounces of the surface. The image forms behind the mirror. The image is formed at the same distance as object and of the same height.

A still lake also acts as a mirror. Thus, reflection takes place from its surface and the image can be seen.

We are able to see objects when light from some source bounces off it and reaches our eye. Thus, reflection occurs here.

But, in case of camera lens, the light passes through a converging lens focuses at a point. Here, the phenomenon of refraction occurs not reflection.

marin [14]4 years ago

3 0

The answer is B. I just took the test.

I hope this helps. :)

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What is the kinetic energy of a 3 kg ball that is rolling at 3 m/s?

prisoha [69]

Answer:

$\Huge \boxed{\mathrm{13.5 \ Joules}}$

Explanation:

$\sf Kinetic \ energy \ (J)=\frac{1}{2} \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2$

$\mathrm{KE=\frac{1}{2} mv^2}$

The mass of the ball is 3 kg.

The velocity of the ball rolling is 3 m/s.

$\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 3^2}$

Evaluating and solving for kinetic energy.

$\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 9}$

$\mathrm{KE=\frac{1}{2} \cdot 27}$

$\mathrm{KE} =13.5$

The kinetic energy of the ball is 13.5 Joules.

7 0

3 years ago

Read 2 more answers

What is produced when constantly changing electric and magnetic fields cause electrically charged particles to vibrate or accele

zhannawk [14.2K]

It would be D) Electromagnetic waves
Hope it helped!

4 0

3 years ago

A charming friend of yours who has been reading a little bit about astronomy accompanies you to the campus observatory and asks

lidiya [134]

Answer:

b

Explanation:

3 0

3 years ago

Two loudspeakers emit sound waves along the x-axis. A listener in front of both speakers hears a maximum sound intensity when sp

yKpoI14uk [10]

Answer

given,

difference between the two consecutive maximum

λ = 0.870 - 0.540

λ = 0.33 m

speed of sound = 340 m/s

b) frequency of the sound

v = f x λ

340 = f x 0.33

$f =\dfrac{340}{0.33}$

f = 1030.3 Hz

a) phase difference

the expression of phase difference is given by

$\phi = \dfrac{2\pi}{\lambda}\ \delta$

$\delta = \Delta x - \lambda$

$\delta = 0.540 - 0.33$

$\delta = 0.21\ m$

now,

$\phi = \dfrac{2\pi}{\lambda}\ \times 0.21$

$\phi = \dfrac{2\pi}{0.33}\ \times 0.21$

$\phi = 3.99 rad$

8 0

3 years ago

Parallel light rays with a wavelength of 563 nm fall on a single slit. On a screen 3.30 m away, the distance between the first d

MrMuchimi

Answer:

The width of the slit is 0.4 mm (0.00040 m).

Explanation:

From the Young's interference expression, we have;

(λ ÷ d) = (Δy ÷ D)

where λ is the wavelength of the light, D is the distance of the slit to the screen, d is the width of slit and Δy is the fringe separation.

Thus,

d = (Dλ) ÷ Δy

D = 3.30 m, Δy = 4.7 mm (0.0047 m) and λ = 563 nm (563 × $10^{-9}$ m)

d = (3.30 × 563 × $10^{-9}$ ) ÷ (0.0047)

= 1.8579 × $10^{-6}$ ÷ 0.0047

= 0.0003951 m

d = 0.00040 m

The width of the slit is 0.4 mm (0.00040 m).

3 0

3 years ago