NSAA NSAA Physics - Waves and Optics

Question 1

A wave has a frequency of 5 Hz and a wavelength of 4 m. What is its speed?

Accepted Answer

20 m/s

Answer

1.25 m/s

Answer

9 m/s

Answer

40 m/s

Question 2

Which type of wave requires a medium to travel through?

Accepted Answer

Mechanical waves

Answer

Electromagnetic waves

Answer

Light waves

Answer

Radio waves

Question 3

A light ray passes from air into glass and bends toward the normal. This is because in glass the light:

Accepted Answer

Travels slower

Answer

Has higher frequency

Answer

Travels faster

Answer

Has longer wavelength

Question 4

What is the period of a wave with frequency 50 Hz?

Accepted Answer

0.02 s

Answer

0.002 s

Answer

0.2 s

Answer

50 s

Question 5

In the double-slit experiment, constructive interference occurs when the path difference between the two sources is:

Accepted Answer

Any multiple of λ

Answer

An odd multiple of λ/2

Answer

Zero only

Answer

A non-integer multiple of λ

Question 6

A concave mirror has a focal length of 10 cm. An object is placed 30 cm in front of it. Where is the image formed?

Accepted Answer

15 cm in front of the mirror

Answer

10 cm behind the mirror

Answer

30 cm in front of the mirror

Answer

20 cm in front of the mirror