Physics Sem B End of Semester Test

Which explanation best describes a wave?

• a disturbance that travels through a medium with a transfer of energy and without a transfer of matter

• a disturbance that travels through a medium with a transfer of energy and matter

• a disturbance that travels through a medium without a transfer of energy and matter

Which type of wave cannot travel in a vacuum?

• microwave

• sound wave

• radio wave

How are period and frequency related to each other?

• Period is the reciprocal of frequency.

• Period is half the frequency.

• Period is twice the frequency.

What happens to the amplitude of the resultant wave when two sound waves with equal amplitude constructively interfere?

• It is half than the amplitude of each wave.

• It is twice than the amplitude of each wave.

• It is the mean of the amplitudes of the two waves.

Jenny and Fred both play a long note on their trombones. A stationary observer hears the sound increasing and decreasing repeatedly in loudness. Which of these must be true?

• The sound waves from the two trombones have slightly different frequencies.

• The sound waves from the two trombones have the same frequency.

• The sound waves from the two trombones have slightly different amplitudes.

Which of these parameters is directly related to sound frequency?

• wavelength

• sound pitch

• wave velocity

While playing her guitar, Karen plucks one string with increasing levels of force. What effect does this have on the sound produced?

• The frequency of the sound keeps increasing.

• The amplitude of the sound keeps increasing.

• The amplitude of the sound keeps decreasing.

Which sequence shows all the spectral colors of the visible light arranged in a decreasing order of their wavelength?

• red, yellow, orange, blue, green, indigo, and violet

• red, orange, yellow, green, blue, indigo, and violet

• violet, indigo, blue, green, yellow, orange, and red

Which is a property of a virtual image?

• always upright

• always inverted

• always magnified

What happens when a light ray passes through the focal point, and then reflects off of a convex mirror?

• The reflected ray will run parallel to the center of curvature.

• The reflected ray will run parallel to the principal axis.

• The reflected ray will pass through the center of curvature.