Hubble's Law: a Giant Star in Another Galaxy Exploded 67

question 35

Multiple Choice

Hubble's law: A giant star in another galaxy exploded 67 million years ago, forming a supernova. The event is observed by an astronomer on Earth. Estimate the speed at which the supernova (and its galaxy) recedes from Earth if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 10⁸ m/s, 1 ly = 9.461 × 10¹⁵ m, 1 y = 3.156 × 10⁷ s)

• A) 1200 km/s
• B) 670 km/s
• C) 1500 km/s
• D) 2700 km/s
• E) 4700 km/s

---

Definitions:

Job Enrichment

Attempts to increase both the number of tasks a worker does and the control the worker has over the job.

Turnover

The rate at which employees leave a workforce and are replaced by new personnel, reflecting the company's retention success and workplace satisfaction.

Employment-At-Will Doctrine

A legal principle that allows employers and employees to terminate employment at any time without reason, as long as it does not violate any contract or law.

Public-Policy Exception

A legal doctrine that prevents employers from terminating employees in violation of well-established public policy of the state.