Rapidly rotating column of air that is in contact with both the surface of the Earth and cloud

Define the solid angle.

What will be an ideal response?

The Moon's Orientale and Mercury's ________ Basin are both huge, multiringed impact scars

Fill in the blank(s) with correct word

A circular hole is drilled into an aluminum sheet. When the sheet is heated, the diameter of the hole will

a. become smaller. b. become larger. c. depend on the thickness of the sheet. d. not be affected.

What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 4 jumps to the final state n = 2?

(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 243 nm B) 486 nm C) 556 nm D) 609 nm E) 312 nm