Matter Waves: Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)

A. 690 ?m
B. 350 ?m
C. 1000 ?m
D. 1400 ?m

Answer: A

Physics & Space Science

What is the angular speed about the rotational axis of the Earth for a person standing on the surface?

a. 7.3 × 10^?5 rad/s b. 3.6 × 10^?5 rad/s c. 6.3 × 10^?5 rad/s d. 3.1 × 10^?5 rad/s

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Physics & Space Science

The least massive red main-sequence stars may have lifetimes of a trillion years

Indicate whether the statement is true or false

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Physics & Space Science

•What is the major fossil fuel impurity?

• (a) nitrogen (b) sulfur (c) carbon (d) water

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Physics & Space Science

A cube of aluminum is at a depth of 1.000 km under seawater whose density is The bulk stress on the cube due to the seawater is

A.
B.
C.
D.
E.

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Physics & Space Science