# Classical Mechanics-Relativistic Kinematics (GATE (Graduate Aptitude Test in Engineering) Physics): Questions 5 - 9 of 16

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## Question number: 5

» Classical Mechanics » Relativistic Kinematics

Appeared in Year: 2012

MCQ▾

### Question

A rod of proper length oriented parallel to the X- axis moves with speed along the Y – axis in the S – frame, where C is the speed of light in free space. The observer is also moving along the X – axis with speed with respect to the S – frame. The length of the rod as measured by the observer is

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d.

## Question number: 6

» Classical Mechanics » Relativistic Kinematics

Appeared in Year: 2013

MCQ▾

### Question

An electron is moving with a velocity of in the same direction as that of a moving photon. The relative velocity of the electron with respect to photon is –

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f

## Question number: 7

» Classical Mechanics » Relativistic Kinematics

Appeared in Year: 2013

MCQ▾

### Question

The relativistic form of Newton’s second law of motion is –

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## Question number: 8

» Classical Mechanics » Relativistic Kinematics

Appeared in Year: 2010

MCQ▾

### Question

A meson at rest decays into two photons, which move along the axis. They are both detected simultaneously after a time, . In an inertial frame moving with a velocity in the direction of one of the photons, the time interval between the two detections is –

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## Question number: 9

» Classical Mechanics » Relativistic Kinematics

Appeared in Year: 2009

MCQ▾

### Question

Assuming the mean life time of a muon (in its rest frame) to be , its life time in the laboratory frame, when it is moving with a velocity is –

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