Practise questions | Salam Academy

SA-9702-QP1-0032 marksL2 StandardCalculatorPhotoelectric effect

Ultraviolet light with photons of energy

4.97

eV falls on zinc, work function

4.30

eV. Calculate the maximum kinetic energy of the photoelectrons, in eV.

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SA-9702-QP1-0052 marksL2 StandardCalculatorPhotoelectric effect

A metal has work function

2.3

eV. Calculate its threshold frequency, in units of

10^{14}

Hz. (

h=6.63\times10^{-34}

J s)

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SA-9702-QP2-0022 marksL2 StandardCalculatorde Broglie wavelength

Electrons are accelerated from rest through

5000

V. Calculate their de Broglie wavelength, in units of

10^{-11}

m. (

h=6.63\times10^{-34}

J s;

m_e=9.11\times10^{-31}

kg;

e=1.60\times10^{-19}

C)

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SA-9702-QP2-0051 markL2 StandardCalculatorDuality evidence

In an electron diffraction tube, the accelerating p.d. is increased. The rings on the screen

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SA-9702-QP3-0012 marksL2 StandardCalculatorEnergy levels

An electron in hydrogen falls from

-1.51

eV to

-3.40

eV. Calculate the wavelength of the emitted photon, in nm. (

h=6.63\times10^{-34}

J s;

c=3.00\times10^8

m s⁻¹;

1

eV

=1.60\times10^{-19}

J)

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SA-9702-QP3-0051 markL2 StandardCalculatorLine spectra

Dark lines in an absorption spectrum occur because

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SA-9702-SU1-0022 marksL2 StandardCalculatorStrings & pipes

A string

1.2

m long is fixed at both ends. Waves travel along it at

240

m s⁻¹. Calculate its fundamental frequency.

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SA-9702-SU1-0042 marksL2 StandardCalculatorStrings & pipes

A pipe

0.85

m long is closed at one end. The speed of sound is

340

m s⁻¹. Calculate its fundamental frequency.

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SA-9702-SU1-0052 marksL2 StandardCalculatorStrings & pipes

A pipe

0.85

m long is open at both ends. Calculate its fundamental frequency. (

v=340

m s⁻¹)

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SA-9702-SU2-0022 marksL2 StandardCalculatorDouble slit

Light of wavelength

500

nm passes through slits

0.25

mm apart onto a screen

1.5

m away. Calculate the fringe spacing, in mm.

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SA-9702-SU3-0032 marksL2 StandardCalculatorOrders & spectra

For a grating with

d=2.00\times10^{-6}

m and light of wavelength

600

nm, determine the highest order of maximum that can be observed.

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SA-9702-SU3-0042 marksL2 StandardCalculatorGrating equation

A second-order maximum is seen at

36.9^\circ

with a grating of spacing

2.00\times10^{-6}

m. Calculate the wavelength, in nm.

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SA-9702-TD1-0031 markL2 StandardCalculatorInternal energy

When ice melts at

0

°C, its internal energy

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SA-9702-TD1-0051 markL2 StandardCalculatorIdeal gas internal energy

The thermodynamic temperature of a fixed mass of ideal gas is doubled. State the factor by which its internal energy increases.

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SA-9702-TD2-0022 marksL2 StandardCalculatorFirst law

During the expansion above,

900

J of heat is supplied to the gas. Calculate the increase in internal energy.

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SA-9702-TD2-0051 markL2 StandardCalculatorFirst law

An ideal gas expands isothermally. Which is correct?

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SA-9702-TE2-0032 marksL2 StandardCalculatorSpecific heat capacity

A

50

W heater warms a

1.0

kg aluminium block by

11

K in

200

s. Calculate the specific heat capacity of aluminium.

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SA-9702-TE2-0041 markL2 StandardCalculatorSpecific heat capacity

In an experiment to measure

c

, some energy is lost to the surroundings. The calculated value of

c

will be

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SA-9702-WA1-0022 marksL2 StandardCalculatorProgressive waves

Two points on a progressive wave of wavelength

0.40

m are

0.10

m apart along the direction of travel. Calculate their phase difference, in degrees.

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SA-9702-WA1-0032 marksL2 StandardCalculatorProgressive waves

On an oscilloscope, one cycle spans

4.0

divisions with the time-base at

2.0

ms div⁻¹. Calculate the frequency.

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