Physics Based Test

A circuit has two resistor in series. The first is 1000

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2.

See the figure. If net force on the 1 nC charge is zero. What is q? (n is nano and means 10^-9)

[removed]A) 0.68 nC
[removed]B) 0.75 nC
[removed]C) 12.0 nC
[removed]D) 1.0 nC

3.

The mass of a proton is 1.6726 × 10^-27 kg and the mass of a neutron is 1.6749 × 10^-27 kg. A proton captures a neutron forming a deuterium nucleus. One would expect the mass of this nucleus to be:

[removed]A) greater than (1.6726 + 1.6749) × 10^-27 kg.
[removed]B) less than (1.6726 + 1.6749) × 10^-27 kg.
[removed]C) equal to (1.6726 + 1.6749) × 10^-27 kg.
[removed]D) any of these; it depends on the energy released during the capture.

4.

Calculate the binding energy of

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5.

A beam of light traveling in air is incident on a transparent plastic at an angle of incidence of 26^o. What is the angle of refraction if the index of refection of the material is 1.41?

[removed]A) 12^o
[removed]B) 26^o
[removed]C) 18^o
[removed]D) 51^o

6.

The work function of a material is 3.5 eV. If the material is the illuminated with monochromatic light (l = 300 nm), what are:

a) the stopping potential

b) the cutoff frequency

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7.

An atom has 8 protons and 17 nucleons. If it undergoes beta - decay, what are the number of protons and neutrons, respectively, in the daughter nucleus?

[removed]A) 8, 18
[removed]B) 7, 16
[removed]C) 8, 17
[removed]D) 9, 17

8.

If light is traveling from a material with an index of refraction of 1.57 into air, what is the critical angle for total internal reflection?

[removed]A) 97.3^o
[removed]B) 39.6^o
[removed]C) 15.9^o
[removed]D) 12.1^o

9.

A radioactive sample has a half-life of 2.5 min. What fraction of the sample is left after 40 min?

[removed]A) 1/256
[removed]B) 1/16
[removed]C) 1/8
[removed]D) 1/65,536

10.

An object is 25 cm from a thin lens with a focal length of 15 cm. Where is the image formed?

[removed]A) 39 cm
[removed]B) 20 cm
[removed]C) 37.5 cm
[removed]D) 10 cm

11.

In the ground state, the quantum numbers (n, l, m_l, m_s) for hydrogen are, respectively,

[removed]A) 1, 1, 1, 1.
[removed]B) 1, 0, 0, 0.
[removed]C) 1, 1, 1, ±1/2.
[removed]D) 1, 0, 0, ±1/2.

12.

If a circuit has a total resistance of 24

[removed]A) 12.0 V
[removed]B) 80.0 V
[removed]C) 9.00 V
[removed]D) 8010 V

13.

A photon is incident on a metal that has a work function of 6.80 eV. If the longest wavelength of light is emitted, what type of light is this?

[removed]A) radio
[removed]B) visible
[removed]C) ultraviolet
[removed]D) infrared

14.

The energy of a 2.00 keV electron is known to within ±3.00%. How accurately can its position be measured?

[removed]A) 6.0 x 10^-10 m
[removed]B) 2.1 x 10^-10 m
[removed]C) 8.4 x 10^-10 m
[removed]D) 1.5 x 10^-10 m

15.

How many neutrons are produced?

[removed]A) 2.
[removed]B) 3.
[removed]C) 12.
[removed]D) 1.

16.

A magnetic flux of 50 Wb increases to 100 Wb in 10 seconds, what is the induced emf?

[removed]A) 12.0 V
[removed]B) 5.0 V
[removed]C) 10.0 V
[removed]D) No emf is induced

17.

A radioactive sample has a half-life of 10.0 min. If the sample decrease by a factor of 1/16 how much time has passed?

[removed]A) 10.0 min
[removed]B) 20.0 min
[removed]C) 15.0 min
[removed]D) 40.0 min

18.

If an energy intensity of 2000 W is exerted by a spherical source what will be its average power output at a distance of 12 m from it?

[removed]A) 3.1 W/m²
[removed]B) 1.1 W/m²
[removed]C) 2.1 W/m²
[removed]D) 4.1 W/m²

19.

What is the photon energy of blue light has an energy of 5.68x10^-19 J, what is its wavelength?

[removed]A) 350 nm
[removed]B) 450 nm
[removed]C) 200 nm
[removed]D) 550 nm

20.

If 4.0 × 10¹⁸ atoms decay with a half-life of 9.2 years, how many are remaining after 15.2 years?

[removed]A) 7.6 × 10¹⁷
[removed]B) 1.7 × 10¹⁷
[removed]C) 1.3 × 10¹⁸
[removed]D) 1.1 × 10¹⁸

21.

An electron is accelerated from rest to a speed of 7.89 x 106 m/s, what potential difference did it cross?

[removed]A) 512 V
[removed]B) 177 V
[removed]C) 300 V
[removed]D) 295 V

22.

If the force between two charges decreases by a factor of 100 because the charges are moved further apart?

[removed]A) 10
[removed]B) 16
[removed]C) 2
[removed]D) 8

23.

If a long current carrying wire created a magnetic field of 1.2 x 10-7 T, what is the current if you are 12.0 cm from it?

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24.

An atom has 97 protons and 251 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?

[removed]A) 94, 247
[removed]B) 96, 245
[removed]C) 100, 249
[removed]D) 95, 247

25.

In the nuclear reaction e- + e+ (assume the particles are not moving to begin with), what is the net energy released in keV?

[removed]A) 1022 keV
[removed]B) 511 keV
[removed]C) 1,000,000 keV
[removed]D) 100 keV