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Subject: Physics, asked on 18/2/18

Q.3. There are two sources of light, each emitting with a power of 100 W. One emits X-rays of wavelength 1 nm and the other visible light at 50 nm. Find the ratio of number of photons of X-rays to the photons of visible light of the given wavelength?

Subject: Physics, asked on 11/2/18

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A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260 Hz and the wavelength is 1.29m, how far away is the hill? 

Subject: Physics, asked on 11/2/18

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Q. A string is fastened tightly between two walls 24 cm apart. The wavelength of the second overtone is 

Subject: Physics, asked on 11/2/18

In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280 Hz, the frequency of the third overtone is

Subject: Physics, asked on 11/2/18

Give any 2 uses of all EM waves.

Subject: Physics, asked on 11/2/18

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Q. Write the expression for displacement current.
Q. Write down the expression for the velocity of electromagnetic wave in (a) Vacuum and (b) material medium.

Subject: Physics, asked on 11/2/18

A length of wire has a frequency of 255 Hz when stretched by a force of 225 N. If the force increase to 324 N, what is the new frequency of vibration?

Subject: Physics, asked on 10/2/18

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Q. In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500 m/s, what is the depth of the sea?

Subject: Physics, asked on 8/2/18

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    A tuning fork of frequency of 500 c/s is sounded on resonance tube. the first and second resonance are obtained at 17 cm and 50 cm. the velocity of sound in m/sec is
            
170

350

520

850


 

Subject: Physics, asked on 8/2/18

A tuning fork of frequency 480 Hz is in unison with the first overtone of a pipe closed at one end. What is the fundamental frequency of the closed pipe?

Subject: Physics, asked on 8/2/18

A standing wave having 3 nodes and 2 anti nodes is found between two atoms having a distance of 1.2A°. between them the wavelength of standing wave will be
(A) 3.63 A°                        (B) 6.05 A°             (C) 1.21 A°              (D) 2.42 A°

Subject: Physics, asked on 8/2/18

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Q. A vibrating sonometer wire is in resonance with a tuning fork of frequency 150 Hz. If only one loop is formed on the wire and the length of one loop is 40 cm, then the velocity of transverse waves on the wire will be
A. 120 m/s
B. 240 m/s
C. 90 m/s
D. 60 m/s

Subject: Physics, asked on 7/2/18

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A sonometer string and a tuning fork when sounded together gives 6 beats/sec, whether the length of sonometer string is 85 cm or 100 cm, the frequency of tuning fork is
262 Hz
256 Hz
260 Hz
234 Hz

Subject: Physics, asked on 7/2/18

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Q.  What is the velocity of transverse waves traveling along a thin copper wire of length 50 cm and mass 1 gram, if it is stretched by a weight of 4 kg ?  
 
60 m/s

90 m/s

110 m/s

140 m/s

Subject: Physics, asked on 7/2/18

Solve this

The end correction of a resonance column is 1.0 cm. If the shortest length resonating with a tuning fork is 15.0 cm, the next resonating length is

(a) 31 cm
(b) 45 cm
(c) 46 cm
(d) 47 cm

 

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