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Questions and Answers
What is the gravitational potential on the line joining two bodies of mass m and 9m, where the gravitational field equals zero?
In the hydrogen spectrum, which series has the shortest wavelength?
If light travels a distance x in time t₁ in air and 10x in time t₁ in another denser medium, what is the critical angle for this medium?
What is the amount of energy required to form a soap bubble of radius 2 cm from a soap solution?
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If the potential energy of a long spring stretched by 2 cm is U, what will be the potential energy stored in it when stretched by 8 cm?
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When a football player moving southward suddenly turns eastward with the same speed to avoid an opponent, what happens to his velocity?
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Study Notes
Gravitational Potential
- Two bodies of mass m and 9m are placed at a distance R, and the gravitational potential on the line joining the bodies where the gravitational field equals zero is either 20 Gm/R, 8 Gm/R, 12 Gm/R, or 16 Gm/R.
Hydrogen Spectrum
- The shortest wavelength in the Balmer series is unknown.
- The shortest wavelength in the Brackett series is either 16, 22, 42, or 92.
Refraction of Light
- Light travels a distance x in time t₁ in air and 10x in time t₁ in another denser medium.
- The critical angle for this medium is either sin⁻¹(1/10), sin⁻¹(1/12), sin⁻¹(7/8), or sin⁻¹(9/11).
Surface Tension
- The amount of energy required to form a bubble of radius 2 cm from a soap solution is nearly 3.01×10⁻⁴ J, where the surface tension of the soap solution is 0.03 N/m.
Elastic Potential Energy
- The potential energy of a long spring stretched by 2 cm is U.
- If the spring is stretched by 8 cm, the potential energy in it will be either 16U, 2U, 4U, or SU.
Motion in Two Dimensions
- A football player moving southward suddenly turns eastward with the same speed to avoid an opponent.
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Description
Test your knowledge on gravitational potential, hydrogen spectrum, and light travel in different media with this quiz covering questions from question number 1 to 35 in Section-A of the Physics exam.
