SAEED MDCAT
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The property of bending of light around obstacles and spreading of light waves into the geometrical shadow of an obstacle is called:
The distance between two consecutive crests of a travelling wave is 10 cm. If the speed of the wave 50 cm/s, then its frequency would be:_____
Diffraction is prominent when the wavelength of light is:
What is the unit of frequency?
In a standing wave, the distance between a node and consecutive antinode is:
The speed of sound, v, is not affected by a variation in the pressure of the gas, because:
A first harmonic stationary sound wave is produced in the air of the cylinder, which is half filled with water. More water is added to the cylinder, now first harmonic stationary wave is produced with a different frequency. What is the change in frequency and the nature of displacement in air at the water surface?
In Young's double slit experiment, fringe spacing increases if:
Michelson’s interferometer is an instrument that can be used to measure:
Wavelength of a sound wave in air is 10 cm, what is the frequency of the sound wave?
If the wavelength of a wave is 20 cm and its time period is T. What is the distance travelled by a crest on the wave in 1.25T?
Which of the following frequency of sound wave is audible?
Which group consists of only electromagnetic waves:
Which of the following waves cannot be polarized?
A stationary wave is formed in a pipe which is open at one end. If length of pipe is L, then what is the maximum possible wavelength of the wave.?
The shortest distance between two points on a travelling wave that have a phase difference of (pi/3) is 5 cm. If the wave has frequency 500 Hz, what is the speed of the wave?
One vibration can be defined as:
A wave is produced by
Time period of the wave is 1/4 sec. How long does it take to pass 20 complete waves from a point?
A stationary wave is set up in a pipe of length L, which is open from both ends. There are three nodes. How many antinodes are there in the stationary wave?
A stationary wave is formed in a pipe which is open at one end. If two complete loops are formed and the wavelength of the wave is 10 cm, what is the length of the pipe?
As the wavelength of light used increases. the distance between bright fringes in the interference pattern:
In a travelling wave, five complete waves pass through a point in 10 seconds. Frequency of the wave is:
In single slit diffraction, when wavelength λ increases:
A stationary wave setup in a pipe closed at one end, only odd harmonics are generated, which are given by the equation
The shortest distance between two points on the wave that have a phase difference of (pi/3) is 5 cm. What is its wavelength?
A stationary wave is setup on a string which is fixed at both ends. The frequency of the wave is 400 Hz. If the speed of wave is 480 m/s, then what is the length of the string?
Coherent sources are:
If a pipe is closed at one end and open at the other, the closed end is a:
Frequency of a travelling wave is 2000 Hz. Its speed is 300m/s. What is its wavelength?
In Michelson's interferometer, displacement L of mirror and wavelength λ of light are related as:
The distance between two consecutive nodes in a stationary wave is equal to:
Superposition of two waves having slightly different frequency, same amplitude and travelling in the same direction, is called:
A stationary wave is formed in a pipe which is open at both ends. If two complete loops are formed and the wavelength of the wave is 10 cm, what is the length of the pipe?
A pipe is filled with a gas and open at one end. If the length of the pipe is 0.6 m and the speed of sound in the gas in 300 m/s. Then frequencies of the first two harmonics are:
Critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is equal to:
The frequency of a string on a musical instrument can be changed either by:
A standingwave pattern is formed when the length of the string is:
Wave speed per frequency is equivalent to:
A monochromatic light is incident on two slits and interference pattern is produced on screen at the distance L. Now one slit is covered, no light coming from it. What is the change in pattern on the screen?
The maximum value of displacement from the mean position is called:
The object oscillates due to:
A wave has the speed 0.50 m/s. If its wavelength is 1.5 m. What is the period of the wave?
An object is undergoing simple harmonic motion. It's time period is T and total energy is E. he amplitude of vibration is reduced to half. What is the new time period and total energy of the system?
What is an optically active medium?
Whenever a transverse wave travelling in a denser medium, is reflected from the boundary of the rarer medium…
The phase angle between two points is 3 pi. The distance between these points is 15 cm. What is the wavelength of the wave?
In a stationary wave, the distance between a node and an adjacent antinode is equal to:
Which of the following phenomenon proves that light waves are transverse waves?
Michelson's interferometer works on the principle of:
A tuning fork A produces 4 beats with another tuning fork B if the frequency of tuning fork B is 320 Hz, then the frequency of tuning fork A is:
A stationary wave is formed in a pipe which is open at one end. If length of pipe is 5 cm, then what is the maximum possible wavelength of the wave.?
Under the action of the restoring force:
An oscillation is called simple harmonic motion when:
In SONAR we use:______
An air pipe opens at both ends. A stationary wave is produced in second harmonic mode. What is the phase difference between the motion of the particles at the end of the pipe and at the Centre of the pipe?
The speed of sound in Rubber, butyl is 1830 m/s. If its density is 1.35 g/cm^{3} then its elastic modulus would be:
When a monochromatic light travels from glass into air, then…
What is the wavelength of the wave if the phase angle between two points of the medium is 3pi/4 and they are separated through a distance of 3 cm?
The direction of the restoring force is always towards:
In a stationary wave, the distance between adjacent antinodes is equal to:
A transverse wave on a string has an amplitude A A tiny spot on the string is colored red. As one cycle of the wave passes by, what is the total distance traveled by the red spot?
Whenever a transverse wave, travelling in a rarer medium, encounters a denser medium.
A steel wire hangs vertically from a fixed point, supporting a weight of 80 N at its lower end. The diameter of the wire is 0.50 mm and its length from the fixed point to the weight is 1.5 m. If density of steel wire = 7.8 x 10^{3}kg/m^{3}, then what is the fundamental frequency emitted from the wire.
A sound wave has a wavelength λ. What is the minimum possible distance between two points with phase difference 90 deg?
The negative sign in F = k.x, indicates that:
WhatA is echo of sound?
When a wave comes across the boundary of two media, a part of it is reflected back. Which statement is true about reflected wave:
Michelson measured the length of standard metre in terms of the wavelength of:
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