Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

1,283.

In the fig above, what is the angle of reflection of the ray of light at mirror M?

A.

\( 90^{\circ} \)

B.

\( 60^{\circ} \)

C.

\( 45^{\circ} \)

D.

\( 30^{\circ} \)

Correct answer is B

No explanation has been provided for this answer.

1,284.

The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y

A.

12Hz

B.

19Hz

C.

60Hz

D.

75Hz

Correct answer is D

No explanation has been provided for this answer.

1,285.

in the image above, an incident ray XY makes an angle of 15\( ^{\circ} \) with a fixed line AY which is normal to surface of a plane mirror if the mirroe is turned as indicated by the arrow through \( 40^{\circ} \) what angle will the reflected ray make with AY

A.

\( 25^{\circ} \)

B.

\( 40^{\circ} \)

C.

\( 15^{\circ} \)

D.

\( 55^{\circ} \)

E.

\( 95^{\circ} \)

Correct answer is E

incident ray = XY

incidence angle i = 15\( ^{\circ} \)

rotation angle θ = 40º

angle that the reflected ray make with AY = i + 2θ  

= 15 + [2 * 40] = 15 + 80 = 95º