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5 of 11 1. 938 Now is a Mediacorp programme, transmitting its radiofrequency signals at a...
You have a radio station transmitting at wavelength 1 = 300 m. The frequency of this...
You have a radio station transmitting at wavelength 1 = 300 m. The frequency of this radio station is 9.0 x 1010 Hz, i.e., 90 GHz none of these O 1.00 x 10 Hz, i.e., 1.00 MHz 3 x 103 Hz, i.e., 3 kHz
Radiation in the radiofrequency region of the electromagnetic spectrum for use in NMR is often described...
Radiation in the radiofrequency region of the electromagnetic spectrum for use in NMR is often described in terms of frequency, in units of MHz. One common example is 1H resonance frequency at 2.35T, which is 100.0MHz (1.000 x 108Hz). Calculate the values of its angular frequency (ω) in rad/s or s-1, wavenumber (ν̅ ) in cm-1, wavelength (λ) in m, and energy (E) in J.
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz...
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz and 470 kHz. The desired signal has a carrier frequency of 102.3 MHz. (a) What are the two local oscillator frequencies in the receiver (both mixers are superheterodyne)? (3 marks) (b) Explain what an image frequency is. (2 marks) (c) How many image frequencies are there in this communication system? Calculate their frequencies. (5 marks) (d) Explain how this receiver removes each of the...
Assignment 2. Multiple choice assignment. Check the right answer. 5 points each answer 1. The USA...
Assignment 2. Multiple choice assignment. Check the right answer. 5 points each answer 1. The USA FM radio broadcasting utilizes the frequency band A. 0.665 MHz-1.6 MHz B. 80 MHz - 100 MHz C. 88 MHz 108 MHz 2. The pre-emphasis is generally used A. to improve the demodulator performance in the presence of noise in the received signal B. to improve the modulator performance C. to improve the stereophonic effect 3. The intermediate frequency of FM superheterodyne receiver is...
1. The Curiosity Rover has recently landed on Mars and likes to send Twitter updates on...
1. The Curiosity Rover has recently landed on Mars and likes to send Twitter updates on its progress. If a tweet is posted 11 minutes after it was sent, how far is Curiosity from Earth? (Assume there is no network lag.) (_____m) 2. Two microwave frequencies are authorized for use in microwave ovens: 910 and 2590 MHz. Calculate the wavelength of each. (a) (_____cm) (frequency = 910 MHz) (b) (_____cm) (frequency = 2590 MHz)
An Omni-directional antenna with a gain of 1.77 dB in horizontal direction is transmitting 1 Watt...
An Omni-directional antenna with a gain of 1.77 dB in horizontal direction is transmitting 1 Watt at 1 GHz and 5 woatts at 1.5 GHz signal uniformly in a lossless spherical medium with both ?,and ?,equal to 1, in case the answers are different for both signals show the calculations for both signals a. Write the wave equations as a function of R and t. b. Calculate the value of E and H at 1.6 km away from transmitter. c....
A radio station's channel, such as 100.7 FM or 92.3 FM L, is actually its frequency...
A radio station's channel, such as 100.7 FM or 92.3 FM L, is actually its frequency in megahertz (MHz), where 1 MHz=10^6 Hz and 1Hz=1 s^-1. Calculate the broadcast wavelength of the radio station 107.9 FM.
6. The following expression is for an FM signal for transmitting the message signal m(t) rt)...
6. The following expression is for an FM signal for transmitting the message signal m(t) rt) across a channel with additive white Gaussian noise that has a power spectral density of n/2 5 x 1 0-6 W/Hz r(t) 7cos [10 t (a) (5 points) Calculate the output SNR (in dB) of the FM system. 6sin (4000Tt) (b) (5 points) The message signal can instead be transmitted using the Frequency- Shift Keying (FSK) digital system that consist of equally-likely pulses si(t)...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. ) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
You have a radio station transmitting at wavelength 1 = 300 m. The frequency of this radio station is 9.0 x 1010 Hz, i.e., 90 GHz none of these O 1.00 x 10 Hz, i.e., 1.00 MHz 3 x 103 Hz, i.e., 3 kHz
A communication system uses a superheterodyne receiver containing two mixers. The intermediate frequencies are 10.7 MHz and 470 kHz. The desired signal has a carrier frequency of 102.3 MHz. (a) What are the two local oscillator frequencies in the receiver (both mixers are superheterodyne)? (3 marks) (b) Explain what an image frequency is. (2 marks) (c) How many image frequencies are there in this communication system? Calculate their frequencies. (5 marks) (d) Explain how this receiver removes each of the...
Assignment 2. Multiple choice assignment. Check the right answer. 5 points each answer 1. The USA FM radio broadcasting utilizes the frequency band A. 0.665 MHz-1.6 MHz B. 80 MHz - 100 MHz C. 88 MHz 108 MHz 2. The pre-emphasis is generally used A. to improve the demodulator performance in the presence of noise in the received signal B. to improve the modulator performance C. to improve the stereophonic effect 3. The intermediate frequency of FM superheterodyne receiver is...
An Omni-directional antenna with a gain of 1.77 dB in horizontal direction is transmitting 1 Watt at 1 GHz and 5 woatts at 1.5 GHz signal uniformly in a lossless spherical medium with both ?,and ?,equal to 1, in case the answers are different for both signals show the calculations for both signals a. Write the wave equations as a function of R and t. b. Calculate the value of E and H at 1.6 km away from transmitter. c....
6. The following expression is for an FM signal for transmitting the message signal m(t) rt) across a channel with additive white Gaussian noise that has a power spectral density of n/2 5 x 1 0-6 W/Hz r(t) 7cos [10 t (a) (5 points) Calculate the output SNR (in dB) of the FM system. 6sin (4000Tt) (b) (5 points) The message signal can instead be transmitted using the Frequency- Shift Keying (FSK) digital system that consist of equally-likely pulses si(t)...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 106 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. (i) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
5. (a) A radio station broadcasts at a frequency of 91.5 MHz (1 MHz = 10 Hz). At a receiver some distance from the antenna, the maximum magnetic field of the electromagnetic wave detected is 2.10 x 10-11 T. ) (2 pts) What is the maximum electric field of the electromagnetic wave at this receiver? (ii) (1 pt) What is the wavelength of the electromagnetic wave? (b) Sunlight strikes a piece of crown glass at an angle of incidence of...
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