Waves

Question 0

Number of oscillations per unit time

Answer 0

Frequency

Question 1

Maximum displacement from equilibrium position

Answer 1

Amplitude

Question 2

Time taken for one complete oscillation

Answer 2

Period

Question 3

Angle to describe of different stages of oscillatory cycle

Answer 3

Phase difference

Question 4

Restoring force is proportional to displacement and directed towards equilibrium

Answer 4

SHM

Question 5

Gradual loss of energy of an oscillator due to resistance forces

Answer 5

Damping

Question 6

Increase of amplitude when forced to oscillate at natural frequency

Answer 6

Resonance

Question 7

Wave for which points along the wave is at 90 degrees to direction of energy propagation

Answer 7

Transverse

Question 8

Displacement is parallel to energy propagation

Answer 8

Longitudinal

Question 9

A way of transferring energy and momentum

Answer 9

Wave

Question 10

Can travel in vacuum

Answer 10

Electromagnetic waves

Question 11

A wave is associated with a … And travels in a medium (can be vacuum)

Answer 11

Disturbance

Question 12

Speed of .. Determined by properties of the medium (tension and mass per unit length) and not how the wave is created.

Answer 12

Wave pulse

Question 13

Created if one pulse after another is created

Answer 13

Travelling wave

Question 14

Wave moves forward a distance equal to

Answer 14

Wavelength

Question 15

Surface through crests and normal to the direction of propagation of the wave

Answer 15

Wavefront

Question 16

Lines in the direction of propagation of the wave

Answer 16

Rays

Question 17

Rays are radial lines on … Wavefronts

Answer 17

Cylindrical

Question 18

The displacement at a point is the algebraic sum of the individual displacements

Answer 18

Superposition

Question 19

Pulse changes in direction and is inverted when

Answer 19

Reflected

Question 20

The angle of incidence is equal to the angle of…

Answer 20

Reflection

Question 21

Relates the sines of the angles of incidence and refraction to the speed of the wave in the two media

Answer 21

Snells law

Question 22

Applicable to light only, n1sinx1=n2sinx2

Answer 22

Index of refraction

Question 23

Angles of the same angles of incidence but different wavelengths are refracted by different angles

Answer 23

Dispersion

Question 24

Spreading of a wave as it goes past an obstacle or through an aperture

Answer 24

Diffraction

Question 25

In diffraction; if aperture is very small, as if only one point in the wavefront will act as a source of waves, these will be circular, and the wave will spread

Answer 25

Huygens principle

Question 26

Many points on the wavefront will act as sources of secondary waves and these will tend to be planar

Answer 26

If the aperture is large

Question 27

Result of superposition of two waves. Demonstrated by Young

Answer 27

Interference

Question 28

If path difference is an integral multiple of the period of the wave

Answer 28

Constructive interference

Question 29

If path difference is a half integral multiple of the period; waves cancel out and are observed as zero wave

Answer 29

Destructive interference

Question 30

Change in frequency of wave received by an observer compared to the frequency with which it was emitted

Answer 30

Doppler effect

Question 31

When two waves of the same speed, wavelength and amplitude travelling in opposite directions meet, … Is formed

Answer 31

Standing wave

Question 32

Difference between travelling and standing wave

Answer 32

No momentum is transferred

Question 33

Standing wave with both ends fixed; wavelength = 2L

Answer 33

Fundamental

Question 34

When both ends are fixed, wavelengths satisfy

Answer 34

2L / n

Question 35

When one end is fixed and the other is free,

Answer 35

Wavelength = 4L / n

Question 36

Both ends are free, wavelength

Answer 36

2L / n