Author Question: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is ... (Read 45 times)

Sufayan.ah · **on:** Jul 29, 2018

A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a grating for microwaves.

A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs?
A) 64
B) 69
C) 74
D) 79
E) 84

Question 2

A crane lifts a 2500-kg beam using a steel cable whose mass per unit length is 0.650 kg/m. What is the speed of transverse waves on this cable if the upward acceleration of the beam is a steady 3.00 m/s2?

A) 194 m/s
B) 578 m/s
C) 1220 m/s
D) 1880 m/s
E) 222 m/s

triiciiaa · **Reply #1 on:** Jul 29, 2018

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