KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 67 - 69 of 268

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Question number: 67

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

Appeared in Year: 2011

MCQ▾

Question

Due to transitions among its first three energy levels, hydro genic atom emits radiation at three discrete wavelengths λ1, λ2, and λ3 Equation . Then

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 68

» Kinematics » Uniform and Non-Uniform Motion

Appeared in Year: 2012

MCQ▾

Question

A ball of mass m suspended from a rigid support by an inextensible massless string is released from a height h above its lowest point. At its lowest point it collides elastically with a block of mass 2m at rest on a frictionless surface. Neglect the dimensions of the ball and the block. After the collision the ball rises to a maximum height of –

A ball suspended from a rigid support

A Ball Suspended From a Rigid Support

In figure a ball of mass m suspended from a rigid support by an inextensible massless string is released from a height h above its lowest point.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 69

» Rotational Motion » Concepts of Rotational Motion

Appeared in Year: 2011

MCQ▾

Question

Figure below shows a small mass connected to a string, which is attached to a vertical post. If the ball is released when the string is horizontal as shown, the magnitude of the total acceleration (including radial and tangential) of the mass as a function of the angle θ is –

Small mass connected to string, which attached to vertical post

Small Mass Connected to String, Which Attached to Vertical Post

Figure shows a small mass connected to a string, which is attached to a vertical post. The ball is released when the string is horizontal and we have to find the magnitude of the total acceleration (including radial and tangential) of the mass as a function of the angle θ.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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