BMST Waves, Sound, and Light 5

Question 1

The speed of light in a vacuum is approximately:

Accepted Answer

3 × 10⁸ m/s

Answer

The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (about 300,000 km/s).

Question 2

A sound source moves toward a stationary observer. The observer will hear a sound with:

Accepted Answer

Higher frequency than emitted

Answer

When a source moves toward an observer, the Doppler effect causes the observed frequency to be higher than the emitted frequency.

Question 3

Which color of visible light has the shortest wavelength?

Accepted Answer

Violet

Answer

Violet light has the shortest wavelength in the visible spectrum, around 380–450 nm.

Question 4

Longitudinal waves differ from transverse waves in that the medium particles move:

Accepted Answer

Parallel to the direction of wave travel

Answer

In longitudinal waves, particles of the medium vibrate parallel to the direction the wave travels, creating compressions and rarefactions.

Question 5

When two waves interfere destructively, the resulting amplitude is:

Accepted Answer

Reduced or zero

Answer

Destructive interference occurs when crests align with troughs, partially or fully canceling each other to reduce the amplitude.

BMST - Basic Math and Science Test Practice Test