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How does the fringe width in Young’s double-slit experiment change when the distance of separation ‘D’ between the slits and screen is doubled?
In Young’s double-slit experiment, fringe width (w) is directly proportional to the distance (D) between the slits and the screen, given by w = λD/d . When D is doubled, the fringe width also doubles. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-11/
In Young’s double-slit experiment, fringe width (w) is directly proportional to the distance (D) between the slits and the screen, given by w = λD/d . When D is doubled, the fringe width also doubles.
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Define work function for a given metallic surface.
The work function of a metallic surface is the minimum energy required to eject an electron from the metal's surface. It depends on the material and is typically measured in electron volts (eV). For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-11/
The work function of a metallic surface is the minimum energy required to eject an electron from the metal’s surface. It depends on the material and is typically measured in electron volts (eV).
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A bullet is fired and gets embedded in a block kept on table. If table is frictionless, then
In the scenario where a bullet is fired and gets embedded in a block on a frictionless table, we assess the conservation laws that apply to the situation. 1. Momentum Conservation: - During the collision, the system or the bullet along with the block is isolated; no external force acts on the systemRead more
In the scenario where a bullet is fired and gets embedded in a block on a frictionless table, we assess the conservation laws that apply to the situation.
1. Momentum Conservation:
– During the collision, the system or the bullet along with the block is isolated; no external force acts on the system in the horizontal direction (since the table is frictionless). Hence, momentum is conserved.
– Before the collision, the block is at rest, and the bullet is moving with its momentum. After the bullet gets embedded in the block, the total momentum is conserved before the collision to be equal to the total momentum after the collision.
2. Kinetic Energy Conservation:
– In this inelastic collision, kinetic energy is not conserved. Some of the kinetic energy from the bullet goes into internal energy during the collision (such as heat, sound, and deformation of the bullet and block).
3. Potential Energy Conservation:
– Potential energy is not involved in this problem since it does not change due to the fact that the bullet is embedded into the block horizontally on a frictionless table.
Final Answer:
In this case, momentum is conserved.
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An electric motor exerts a force of 40 N on a cable and pulls it by distance of 30 m in one minute. The power supplied by the motor (in watt) is
Use the formula for power to calculate how much power the motor supplies. Power (P) = Work done (W) / Time (t) Step 1: Calculate work done Work done (W) is given by the formula W = Force × Distance Given: Force (F) = 40 N Distance (d) = 30 m Now, calculate the work done: W = 40 N × 30 m W = 1200 J (Read more
Use the formula for power to calculate how much power the motor supplies.
Power (P) = Work done (W) / Time (t)
Step 1: Calculate work done
Work done (W) is given by the formula
W = Force × Distance
Given:
Force (F) = 40 N
Distance (d) = 30 m
Now, calculate the work done:
W = 40 N × 30 m
W = 1200 J (joules)
Step 2: Convert time from minutes to seconds
Since the motor pulls the cable in one minute,
Time (t) = 1 minute = 60 seconds
Step 3: Calculate the power
Now, substitute the values into the power formula:
P = W / t
P = 1200 J / 60 s
P = 20 W
Final Answer:
The power supplied by the motor is 20 watts.
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Two metals A and B have work functions 2eV and 5eV, respectively. Which metal has a lower threshold wavelength?
Metal B has a lower threshold wavelength because threshold wavelength (λ th ) is inversely proportional to the work function (W) as λ th = hc/W . A higher work function results in a shorter threshold wavelength. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapRead more
Metal B has a lower threshold wavelength because threshold wavelength (λ th ) is inversely proportional to the work function (W) as λ th = hc/W . A higher work function results in a shorter threshold wavelength.
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