Physics-
General
Easy
Question
The graph between the instantaneous concentration 
of a radioactive element and time 
is
The correct answer is:
By using 
and 
It shows that 
decreases exponentially with time
Related Questions to study
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The change density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.
The change density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.
physics-General
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Which one of the following has the regular tetrahedral structure? (Atomicnos.:B= 5,S= 16,Ni=28,Xe=54)
Which one of the following has the regular tetrahedral structure? (Atomicnos.:B= 5,S= 16,Ni=28,Xe=54)
chemistry-General
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The correct order of bond angles (smallest n first) in H2S,NH3,BF3 and SiH4 is:
The correct order of bond angles (smallest n first) in H2S,NH3,BF3 and SiH4 is:
chemistry-General
chemistry-
Which of the following bonds require the largest amount of bond energy to dissociate the atoms condensed?
Which of the following bonds require the largest amount of bond energy to dissociate the atoms condensed?
chemistry-General
maths-
maths-General
physics-
In Fig. 
represents time and 
represents activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
In Fig. represents time and represents activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
physics-General
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Which of the following are iosoelectronic and isostructural NO3,CO32, ClO, SO
Which of the following are iosoelectronic and isostructural NO3,CO32, ClO, SO
chemistry-General
chemistry-
Which of the following represent the given mode of hybrid is at ion sp2,sp2,spandsp from left to right:
Which of the following represent the given mode of hybrid is at ion sp2,sp2,spandsp from left to right:
chemistry-General
physics-
Figure shows a square loop 
with edge length 
. The resistance of the wire 
is 
and that of 
is 
. The value of magnetic field at the centre of the loop assuming uniform wire is
Figure shows a square loop with edge length . The resistance of the wire is and that of is . The value of magnetic field at the centre of the loop assuming uniform wire is
physics-General
physics-
Find magnetic field at 
Find magnetic field at
physics-General
chemistry-
How many π-bonds are present in Napthalene molecule-
How many π-bonds are present in Napthalene molecule-
chemistry-General
physics-
A proton accelerated by a potential difference 
moves though a transverse magnetic field of 
as shown in figure. The angle 
through which the proton deviates from the initial direction of its motion is
A proton accelerated by a potential difference moves though a transverse magnetic field of as shown in figure. The angle through which the proton deviates from the initial direction of its motion is
physics-General
physics-
A current carrying closed loop in the form of a right angle isosceles triangle is placed in a uniform magnetic field acting along 
. If the magnetic force on the arm 
is 
, the force on the arm 
is
A current carrying closed loop in the form of a right angle isosceles triangle is placed in a uniform magnetic field acting along . If the magnetic force on the arm is , the force on the arm is
physics-General
physics-
In the adjacent figure is shown a closed path 
A long straight conductor carrying a current 
passes through and perpendicular to the plane of the paper. Then which of the following holds good?
In the adjacent figure is shown a closed path A long straight conductor carrying a current passes through and perpendicular to the plane of the paper. Then which of the following holds good?
physics-General
physics-
A candidate connects a moving coil voltmeter 
and a moving coil ammeter 
and resistor 
as shown in figure? If the voltmeter reads 10 V and the ammeter reads 2 A and than R is
A candidate connects a moving coil voltmeter and a moving coil ammeter and resistor as shown in figure? If the voltmeter reads 10 V and the ammeter reads 2 A and than R is
physics-General
