Welcome to your Stationary and Dopplers effect
1.
A stationary wave is formed by:
2.
In a stationary wave, the distance between two adjacent nodes is:
3.
In a stationary wave, energy is:
4.
A node is a point where:
5.
The fundamental frequency of a closed pipe is:
6.
A string of length 1.5 m is fixed at both ends. The wave speed on the string is 300 m/s. What is the fundamental frequency?
7.
A pipe closed at one end has a length of 0.85 m. The speed of sound in air is 340 m/s. What is its fundamental frequency?
8.
A sound wave of wavelength 0.5 m has a speed of 340 m/s. What is its frequency?
9.
A 2-meter-long pipe open at both ends resonates in its second harmonic. If the speed of sound is 340 m/s, what is the frequency?
10.
An observer is moving toward a stationary source with a speed of 17 m/s. The source frequency is 400 Hz, and speed of sound is 340 m/s. What is the apparent frequency?
11.
A train is moving at 30 m/s and sounding a horn of frequency 500 Hz. A person stands on the platform. Speed of sound = 340 m/s. What frequency does the person hear as train approaches?
12.
A string is vibrating with a fundamental frequency of 150 Hz. If tension is quadrupled, what is the new frequency?
13.
A source and observer move towards each other, each at 10 m/s. The source emits sound of 400 Hz. Sound speed is 340 m/s. What is the frequency heard?
14.
A closed organ pipe produces its 3rd harmonic at 1020 Hz. What is the fundamental frequency?
15.
The speed of a wave on a string is 400 m/s and its frequency is 200 Hz. What is the wavelength?
16.
A pipe closed at one end has a length of 0.85 m and resonates at its third harmonic. What is the frequency? (Speed = 340 m/s)
17.
If beat frequency between two sounds is 6 Hz and one is 240 Hz, what are the possible frequencies of the other?
18.
A pipe open at both ends has a length of 1 m. If the speed of sound is 343 m/s, what is the frequency of the second harmonic?
19.
Two sound waves with frequencies 256 Hz and 260 Hz are played together. What is the beat frequency?
20.
The wavelength of a stationary wave is 0.4 m. The distance between a node and the next antinode is:
21.
Doppler effect in sound is asymmetrical because:
22.
In air, Doppler effect is used in:
23.
A star shows blue shift. It means:
24.
If speed of observer equals wave speed, frequency heard is:
25.
Red shift in galaxies proves:
26.
When observer is stationary and source approaches, apparent frequency:
27.
For Doppler effect in sound, medium must:
28.
A source is moving away with velocity v/2. Observed frequency is:
29.
When both source and observer are approaching each other:
30.
In a stationary wave, particle velocity is:
not too hard not too easy
conceptual and theoretical question
coceptual and theoretical
little bit hard