Physics-
General
Easy
Question
The value of stopping potential in the following diagram
- – 4V
- – 3 V
- – 2V
- – 1 V
The correct answer is: – 4V
Stopping potential is that negative potential for which photo electric current is zero.
Related Questions to study
Physics-
The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote
The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote
Physics-General
Physics-
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is 
and the wavelength of the 
line is 
. As the accelerating voltage is increased
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is and the wavelength of the line is . As the accelerating voltage is increased
Physics-General
Physics-
Statement–I : When two vibrating tuning forks have f1 = 300 Hz and f2 = 350 Hz and held close to each other; beats cannot be heard
Statement–II : The principle of superposition is valid only when f1 – f2 < 10 Hz
Statement–I : When two vibrating tuning forks have f1 = 300 Hz and f2 = 350 Hz and held close to each other; beats cannot be heard
Statement–II : The principle of superposition is valid only when f1 – f2 < 10 Hz
Physics-General
Physics-
Statement–I : The flash of lightening is seen before the sound of thunder is heard
Statement–II : The sound of thunder is produced after the flash of lightening
Statement–I : The flash of lightening is seen before the sound of thunder is heard
Statement–II : The sound of thunder is produced after the flash of lightening
Physics-General
Physics-
Statement–I : The superposition of the waves y1 = A sin (kx –wt) and y2 = 3A sin(kx + wt) is a pure standing wave plus a travelling wave moving in the negative direction along X–axis
Statement–II : The resultant of y1 & y2 is y=y1 +y2 = 2A sin kx cos wt+2A sin (kx+wt)
Statement–I : The superposition of the waves y1 = A sin (kx –wt) and y2 = 3A sin(kx + wt) is a pure standing wave plus a travelling wave moving in the negative direction along X–axis
Statement–II : The resultant of y1 & y2 is y=y1 +y2 = 2A sin kx cos wt+2A sin (kx+wt)
Physics-General
Physics-
Four open organ pipes of different length and different gases at same temperature as shown in figure. Let fA , fB , fC and fD be their fundamental frequencies then:–
Four open organ pipes of different length and different gases at same temperature as shown in figure. Let fA , fB , fC and fD be their fundamental frequencies then:–
Physics-General
Physics-
A clamped string is oscillating in nth harmonic, then:–
A clamped string is oscillating in nth harmonic, then:–
Physics-General
Physics-
Two trains A and B are moving in the same direction with velocities 30 m/s and 10 m/s respectively, B is behind from A, blows a horn of frequency 450 Hz. Then the apparent frequency heard by B is (The velocity of sound is 330 m/s):–
Two trains A and B are moving in the same direction with velocities 30 m/s and 10 m/s respectively, B is behind from A, blows a horn of frequency 450 Hz. Then the apparent frequency heard by B is (The velocity of sound is 330 m/s):–
Physics-General
Physics-
A closed organ pipe of radius r1 and an open organ pipe of radius r2 and having same length 'L' resonate when excited with a given tuning fork. Closed organ pipe resonates in its fundamental mode where as open organ pipe resonates in its first overtone, then:
A closed organ pipe of radius r1 and an open organ pipe of radius r2 and having same length 'L' resonate when excited with a given tuning fork. Closed organ pipe resonates in its fundamental mode where as open organ pipe resonates in its first overtone, then:
Physics-General
Physics-
A cylindrical tube (L = 120 cm.) is in resonance with a tuning fork of frequency 330 Hz. If it is filling by water then to get resonance again, minimum length of water column is (vair = 330 m/s):–
A cylindrical tube (L = 120 cm.) is in resonance with a tuning fork of frequency 330 Hz. If it is filling by water then to get resonance again, minimum length of water column is (vair = 330 m/s):–
Physics-General
Physics-
A wave is represented by the equation y = a sin(kx – wt) is superimposed with another wave to form a stationary wave such that the point x = 0 is a node. Then the equation of other wave is:–
A wave is represented by the equation y = a sin(kx – wt) is superimposed with another wave to form a stationary wave such that the point x = 0 is a node. Then the equation of other wave is:–
Physics-General
Physics-
A copper wire is fixed between two rigid supports. It is stretched with negligible tension at 30°C. The speed of transverse waves in the wire at 10°C will be– (density d = 9 × 103 kg/m3 , Young's modulus Y = 1.3 × 1011 N/m² and temperature coefficient of expansion a = 1.7 × 10–5 /°C):–
A copper wire is fixed between two rigid supports. It is stretched with negligible tension at 30°C. The speed of transverse waves in the wire at 10°C will be– (density d = 9 × 103 kg/m3 , Young's modulus Y = 1.3 × 1011 N/m² and temperature coefficient of expansion a = 1.7 × 10–5 /°C):–
Physics-General
Chemistry-
The correct order of case of dehydration of following is:
I) 
II) 
III) 
The correct order of case of dehydration of following is:
I)
II)
III)
Chemistry-General
Chemistry-
The 
reactivity of the following halides will be in the order:
i) 
ii) 
iii) 
iv) 
v) 
The reactivity of the following halides will be in the order:
i)
ii)
iii)
iv)
v)
Chemistry-General
Physics-
Two wave are represented by equation y1 = a sin wt and y2 = a cos wt the first wave:–
Two wave are represented by equation y1 = a sin wt and y2 = a cos wt the first wave:–
Physics-General
