NSAA NSAA Physics - Waves and Optics 2

Question 1

The critical angle for a glass-air interface is 42°. What is the refractive index of the glass?

Accepted Answer

1.49

Answer

0.67

Answer

1.18

Answer

2.00

Question 2

Sound travels at 340 m/s. What is the wavelength of a 170 Hz sound wave?

Accepted Answer

2 m

Answer

0.5 m

Answer

1 m

Answer

170 m

Question 3

In a transverse wave, the direction of particle vibration is:

Accepted Answer

Perpendicular to wave propagation

Answer

Parallel to wave propagation

Answer

At 45° to wave propagation

Answer

In a circular pattern

Question 4

The Doppler effect causes the observed frequency of a source moving toward an observer to be:

Accepted Answer

Higher than the emitted frequency

Answer

Lower than the emitted frequency

Answer

The same as the emitted frequency

Answer

Undetectable

Question 5

Which phenomenon explains why a straw appears bent when placed in a glass of water?

Accepted Answer

Refraction

Answer

Reflection

Answer

Diffraction

Answer

Dispersion

Question 6

Standing waves are formed by the superposition of two waves that are:

Accepted Answer

Identical, traveling in opposite directions

Answer

Identical, traveling in the same direction

Answer

Of different frequencies, in the same direction

Answer

Of different amplitudes, perpendicular to each other