Question

1. What is the wavelength of a 300.0 GHz radio waves?    a. 0.1mm    b. 1.0 mm    c. 1.0 cm    d. 0.01 m    

2. What is the intensity of an electromagnetic wave with peak magnetic field strength of 1.5 x 10^-4 T?      a. 1.7 x 10^5 W/m^2     b. 2.7 x 10^6 W/m^2   

c. 2.5 x 10^7 W/m^2         d. 3.7 x 10^6 W/m^2

3. An object is placed 15.0 cm from a concave mirror of focal length 5.0 cm. What is the magnification of the image? a. 1.0    b. -1.5    c. -0.5    d. 0.25

Answer 1

1. 2 300 GHZ » ♡ HZ Frequency of padio wave ♡ =300x10? we know, sadio wave is a electromagnetic Velreity of padio wave is e=3x108 m/s. wavelength of sadio wave a 3x108 wave. will be @ e 300 x 109 a 1x10m 21 mm option (6) is connect

2. Хе peak of magnetic field of electromagnetic house is Bo= 105x104T " the intensity of om ware will be I-1 Bol "As, 2=3x108 Mo=48x157 2:7 X106 W/m2 option (6) is conmeet.. Mo (105X10 8 x 3x10 ARXI0 -

3. object distane u= - 15em foreal length of concave mimo f= -5em. According to mimos equation tette = to 7 to its 1-3 t t's not >> $ = -3 at > = 15 - 15 > Lez-15 Is = Im २ Image distance : The magnification of the the image will be ma -re LIS W 2 - -15 = - tor m = -0.5 option (e) is conmeet.