The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?
A) 40 GHz
B) 4.0 GHz
C) 0.75 GHz
D) 75 GHz
E) 7.5 GHz
Question 2The focal length of the objective of a telescope is 75.0 cm. While the eyepiece has a focal length of 6.00 cm, what is the magnifying power of this telescope?
A) 0.0800
B) 0.645
C) 450
D) 12.5
E) 200
Question 3When an object is placed 60. cm from a converging lens, it forms a real image. When the object is moved to 40. cm from the lens, the image moves 10. cm farther from the lens. What is the focal length of the lens?
A) 42. cm
B) 50. cm
C) 40. cm
D) 20. cm
E) 30. cm
Question 4At what frequency does an object with a temperature of 1000 K radiate the most power?
A) 1.0 1014 Hz
B) 8.0 1014 Hz
C) 2.3 1012 Hz
D) 6.7 1013 Hz
E) 4.1 1011 Hz
Question 5From the Earth, they see the Enterprise approaching at 0.800c and the Klingons approaching from the opposite direction at 0.900c. From the Enterprise, the crew sees the Klingon ship approaching at what speed?
What will be an ideal response?
Question 6Severe, long-term cooling periods during the Earth's history are known as
A) snowball Earth
B) ice storms
C) ice ages
D) nuclear winters
Quick Reply
