Suppose that you seal an ordinary 60W lightbulb and a suitable battery inside a transparent enclosure and suspend the system from a very sensitive balance. (a) Compute the change in the mass of the system if the lamp is on continuously forone year at full power. (b) What difference, if any, would it make if the inner surface of the container were a perfect reflector?

Q: What is the standard unit of measurement of Force? a) Newton b) Joule c) Meter d) Newton-meter

A: A

Q: The number 0.005900, in standard scientific form can be expressed as ______ a) 5.9×103 b) 59×104 c) ...

A: A

Q: The transmission based on tunnel effect is that of a plane wave through a ____________ a) Circular B...

A: C

Q: The velocity of a (fast) automobile on a straight highway is given by the function to the right, whe...

A: The area of velocity time graph gives the displacement.

Q: In which coordinate system do we use distance from origin and to angles to define the position of a ...

A: C

Q: Which of the following are obtained by dividing total displacement by total time taken? a) Average v...

A: A

Q: Consider a particle trapped in a 1D box with zero potential energy with walls at x = 0 and x = L. Th...

A:

Q: Which of the following is the correct expression for the total number of nodes? a) n – 1 b) l – 1 c)...

A: A

Q: The electron probability density is greatest at ____________ a) r = 0 b) r = n c) r = l d) r = me

A: A

Q: Tunnel effect happens during nuclear fusion in stars. a) True b) False

A: A

Q: Determine the Miller indices for the directions A, B, C and D shown in the following cubic unit cell...

A: The structure is a cubic unit cell.So, one cube has each side length equal to unityThe A plane inter...

Q: Electric Field. Two positive charges are located on the x-axis. The second charge (has twice the mag...

A: Enet=kqr12+2qr22    r1=r2 =r=kqr2+2qr2=3kqr2 Let the positive charge

Q: relative velocity of a body A with respect to a body B is 5 m/s. The absolute velocity of body B is ...

A: b

Q: (1) (2) Given above are arrangements of two electric charges of the same charge magnitude and a poin...

A: Coulomb's Law The force between two charges q1 and q2 is directly proportional to the product of the...

Q: U The trajectory of an object is defined as x = (t-4)2, what is the velocity at t = 5? a) 2 b) 5 c) ...

A: A

Q: body moves a distance of 15 m in a 15mins, with an initial velocity of 0m/min. What is the final vel...

A: C

Q: 4. The charred bones of a sloth in a cave in Chile represent the earliest evidence of human presence...

A: Given, Bone sample specific activity =5.22 d/min.g Living organism specific activity=15.3 d/min.g t1...

Q: Which of the following is the standard unit of measurement of mass? a) Gram b) Kilogram c) Pound d) ...

A: B

Q: b- Explain how the materials properties depend on the bonding energy such as modules of elasticity, ...

A: material properties depends on  1. bonding energy: bonding energy directly related to melting temper...

Q: What is least count of an instrument? a) The lowest value that can be measured accurately b) The gre...

A: A

Q: 1 4 A B C The figure above shows four very thin parallel planes of charge with equal separation betw...

A:

Q: The density of silver is 10.5 g/cm3 and its atomic weight is 108. If each atom contributes one elect...

A: D

Q: The number of base units for measuring physical quantities according to the SI system are ____ a) 1 ...

A: C

Q: 1-

A: When electro magnetic waves enter a medium from vacuum wavelength decreases . λn=λ0n  , where λn = w...

Q: What is the path length of the following path? A (0, 0) to B (5, 0) to C (5, 5) to D (0, 5) a) 20 un...

A: C

Q: how to get this problem? thank you!

A: In this case, the wave function and its complex conjugate are given in the following way. Assumptio...

Q: Which mathematical quantity is imagined to be present at the center of a black hole? a) Unity b) Sin...

A: Answer:-   Option (b) correct. Singularity

Q: Find the largest allowable time constant for this sensor. A 10-in-stroke wirewound translational pot...

A: The Explanation Given below:

Q: What is the reason for the occurrence of systematic errors in an instrument ? a) No use for a long t...

A: B

Q: The subshell dz2 has no nodal plane. a) True b) False

A: A

Q: The theory which believes that the universe works like a heart beating in rhythms is _________ a) Os...

A: A

Q: How many variables are required to define the position of a body in space? a) 3 b) 2 c) 1 d) 0

A: A

Q: What will happen if the density of the universe is less than the critical density? a) The Universe w...

A: D

Q: small block is placed over another block which is moving with a velocity of 5m/s. What is the absolu...

A: A

Q: Zeeman Effect could not be proved by ________ a) Quantum Mechanics b) Bohr’s Model c) Hamiltonian op...

A: B

Q: Nodes are the plane where the probability of finding an electron is 1. a) True b) False

A: B

Q: Helium shows Bose-Einstein condensation below what temperature? a) 100.5 K b) 12.3 K c) 5.12 K d) 2....

A: D

Q: Between what two integers is : (160 х 10 10. 5 x 10 ") * 1.1 x 10 -11 & Which integer is it closest ...

A:

Q: 2) A small object of mass 1 mg is confined to move between two rigid walls separated by 1 cm. a) Cal...

A:

Q: Prove that in the case of elastic collision the value of the coefficient of recovery is 1

A:

Q: the test load is q⁰ = 4 milliculons whereas the potential at point A is 6V and the potential at poin...

A: Given: test particle charge q0= 4*10-3 C potential of point A (VA) = 6 V potential of point B (VB) =...

Q: Which of the following gives the most accurate result for time measurement? a) Wall clock b) Digital...

A: D

Q: What will be the velocity v/s time graph of a ball falling from a height before hitting the ground l...

A: A

Q: Mass can be explained as _____ a) Amount of space b) Amount of time c) Amount of weight d) Amount of...

A: D

Q: What does relative motion signify? a) The motion of a body with respect to other body b) Uniformly a...

A: The relative motion can be described as the movement of an object with respect to the different obje...

Q: In Raman spectroscopy, the radiation lies in the ________ a) Microwave Region b) Visible Region c) U...

A: B

Q: Bosons have symmetrical wave functions. They do not obey ______ a) Aufbau principle b) Pauli’s Exclu...

A: B

Q: Fermi-Dirac statistics is for the ________ a) Distinguishable particles b) Symmetrical Particles c) ...

A: D

Q: Which force can possibly act on a body moving in a straight line? a) Tangential force b) Friction fo...

A: Explanation: a)Tangential force: It is a force that acts on a moving body in the direction of a tang...