KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 113 - 115 of 250

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Question number: 113

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

Appeared in Year: 2012

MCQ▾

Question

A standing wave in a pipe with a length L = 1.2 m is described y,

y(x,t)=y0sin[(2πL)x]sin[(2πL)x+π4]

Based on above information, which one of the following statement is incorrect?

(Speed of sound in air is 300 ms-1)

Choices

Choice (4) Response

a.

The frequency of the fundamental mode of vibrations is 137.5 Hz

b.

There could be a nods at x=0 and antinode at x=L2

c.

A pipe is closed at both ends

d.

The wavelength of the wave could be 0.6 m

Question number: 114

» Atoms and Nuclei » Mass-Energy Relation

Appeared in Year: 2013

MCQ▾

Question

A nuclear decay is possible if the mass of the parent nucleus exceeds the total mass of the decay particles. If M (A, Z) denotes the mass of a single neutral atom of an element with mass number A and atomic number Z, then the minimal condition that the β decay

XZAYz+1A+β+Ve

will occur is (me denotes the mass of the β particle and the neutrino mass mv can be neglected):

Choices

Choice (4) Response

a.

M(A,Z)>M(A,Z+1)+me

b.

M(A,Z)>M(A,Z+1)

c.

M(A,Z)>M(A,Z+1)+Zme

d.

M(A,Z)>M(A,Z+1)me

Question number: 115

» Work, Energy and Power » Work-Energy Theorem

Appeared in Year: 2012

MCQ▾

Question

A stream of photons having energy 3 eV each impinges on a potassium surface. The work function of potassium is 2.3 eV. The emerging photo-electrons are slowed down by a copper plate placed 5 mm away. If the potential difference between the two metal plates is 1V, the maximum distance the electrons can move away from the potassium surface before being turned back is

Choices

Choice (4) Response

a.

3.5 mm

b.

5.0 mm

c.

1.5 mm

d.

2.5 mm

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